Multimeters can also be used to measure current in this drain test. It can be made useful again through a car battery charger. Battery Capacity - The electric output of a cell or battery on a service test delivered before the cell reaches a specified final electrical condition and may be expressed in ampere-hours, watt- hours, or similar units. • Use this unit with a 12-volt battery and negative grounding only. My car is now a fire hazard and can't be driven. And if you read any auto maintenance book, subject relating to 'electric', it advises to NEVER run engine with cables disconnected from the battery. therefore no battery no drain. Jul 01, 2017 · I checked current draw with ammeter in series between disconnected battery cable (either pos or neg is ok) and battery post. Re: Starter turns when hooking up battery (key not in ignition) This is a picture of your igntion switch. Disconnect the Battery. This is the last connection you need to make. battery through a key switch and/or start button to the coil of the magnetic switch and back to the battery. To disconnect a car battery, start by turning off the engine and opening the hood so you can access the battery. I always disconnect mine, the batteries can slowly discharge thru the alternator or other systems on the boat over time, and a totally discharged battery can freeze. Will disconnecting neg. Aug 08, 2008 · Obviously, it powers your pedals, but in most designs, connecting a jack to the DC input on the pedal also disconnects the battery, which means you can leave your pedal plugged in, and if by any chance your power supply breaks down (esp. Next, remove the DMM lead from the positive battery terminal and touch it to the terminal on the disconnected negative battery cable. Disconnect the negative battery cable and then the positive cable with a combination wrench. There shouldn't be much amps at all. A battery's positive terminal does have a positive potential. [Quick lesson to check for a battery draining power (aka "parasidic draw") when the car is off - by disconnecting the negative battery cable from the negative battery terminal, then hooking up a 12 volt bulb between the disconnected negative battery cable and the negative battery terminal with all switches and all electric turned off including. Left it unplugged for an hour, only had to reset date, time and input radio code. Disconnect the positive and negative battery terminal. Same with the positive cable. Nov 27, 2019 · Once the dead car starts, disconnect the cables and allow the car to run for some time. When you're experiencing a problem keeping the battery on your John Deere 318 garden tractor charged, you may be tempted to remove the negative battery cable from the battery while the machine is. Remote Negative (−) Terminal. If the cables do. So the reason is to keep the spark away from hydrogen gas. 4 Fsi BKG Engine code, fitted new battery but has a battery drain of 0. It should not incur any degradation of voltage disconnected, especially if the time period is just overnight. Procedure is the same for all engines. For added security, you can remove the battery and connect it to the charger in a separate location from the vehicle. I have had the battery. i removed the battery and gave it to a local battery shop for charging. Although some batteries last much longer, most batteries begin breaking down chemically after four years, so you could experience dimmer headlights and other negative effects before you have a dead battery in your Magnum that you need to replace. Current drain on the battery can be checked with an ammeter. Battery Cable Terminal End. Well obviously, you dont want the engine to turn over while your working on it. Jan 28, 2013 · A stuck relay in the car can drain the battery. For safety purposes, always proceed to disconnect the negative cable first. The most recently reported issues are listed below. The only time the switch is really needed is if you have a accident, or another issue at the track and when a rescue crew turns it off. 8 volts steady all the time unless I let it sit with the 2. The photos and captions chronicle the installation of an Optima battery in a Bitchin’ finned aluminum battery box within the trunk of my deuce hi-boy roadster. Nov 27, 2019 · Once the dead car starts, disconnect the cables and allow the car to run for some time. Typically the battery disconnect switch is designed to disconnect the house batteries similar to pulling the negative cable off the battery so nothing can drain it when the unit is not in use or in storage. Disconnect pos battery cable and put an amp meter, on the highest scale, in series with the cable to the battery,,digital meter preferred. Pull the cable away from the negative battery terminal. Battery Cable Problems of Chevrolet Silverado 1500 Chevrolet Silverado 1500 owners have reported 18 problems related to battery cable (under the electrical system category). Next, disconnect and remove the positive battery cable. A disconnect on the front of the vehicle supplies the winch or a jumper cable. Nov 27, 2019 · Once the dead car starts, disconnect the cables and allow the car to run for some time. When disconnecting a battery, remove the negative terminal (-) cable first, then the positive (+) cable. STEP 16: Disconnect the black (negative) cable connected to dead car's engine. Not too long ago, we ran into a hard-start issue with a. Car battery drains overnight, what is sucking the life out of the battery? Follow this simple check list to see what is causing the drain and how to fit it Receive helpful tips and a free copy of my popular auto-repair ebook, A Mechanic Comes Clean. Next, cut off about 1/2 in. All problems fixed. It is one of those smaller type batteries. This will prevent accidental damage to onboard electronics or wiring if you accidentally cross up the wrong wires or short out a live circuit. The other very large battery cable is the negative cable, normally black. Set the Multimeter to the 10Amp setting, connect one test wire to the negative terminal, then the other test lead to the negative wire (to reconnect the circuit if you like). Buy only a car battery charger that is compatible for your car's battery. This other question has some interesting remarks on battery leakage. AGM and Gel Cell battery cable terminals should be maintained at least one time per month while the RV is in use. I don't blame you for not wanting to replace it, but with the information you have provided, it leads directly to a bad battery. When the car starts, turn off the engine of the charging car before disconnecting the cables; this will help prevent a spike to that car's computer. Just disconnect the negative and the battery will stay charged. If you still see now current draw, try charging your battery and then leaving it disconnected over night to see if it still draws down to 1V as you said. Maybe the shop discharged my battery (leaving lights on or whatever), and now battery just sucks and can't hold a charge. It is one of those smaller type batteries. Power Inverter FAQ. Sep 05, 2007 · You either can wire the alternator upstream of switch (between battery and switch) or use a alternator shutdown relay. Current drain on the battery can be checked with an ammeter. if there is a power drain you will see a faint spark. Use two new cables, slice off the rubberized material at each end, enough to let you use the metal strips inside to form rudimentary circles or loops that can go around the nodes on your car battery. Dec 08, 2009 · Disconnect the negative cable from that battery and insert the meter in-line with that cable. It should not incur any degradation of voltage disconnected, especially if the time period is just overnight. Replied by twiggy02919 on topic Honda Accord Battery Drain First, double check your current as Trcustoms suggested. The tractor has a "ghost battery drain" no one has been able to find in five years (Case/IH experts have searched). Shopsarahmac is one of the favourite online stores for buying Car Battery Terminals Not Working at much lower prices than you would pay if shopping on other similar services. The IBS sensor is mounted on top of battery negative terminal and has the ground cable and two connectors. Apr 26, 2017 · It depends on how old your battery is to begin with. The ground is the heavy cable, normally color coded black, that attaches to the negative terminal of the battery. Datasheet; Series Details; Order Samples. If you are in the milliamp range, you will likely blow a fuse in the meter if you have a significant short circuit. The dealer installed a Blue Ox Aventa 10,000 lb tow bar and used totally separate wiring for the towed vehicle running all the way back to the Tahoe's taillights, including separate bulbs. if your doors are open when you reconnect the battery the alarm will sound, usually sending your head into the hood, and the hood back down on top of your head. Oct 08, 2012 · When testing for parasitic drain, use an ammeter in series with the battery cable and battery. 9 randomly but if I disconnect the battery it registers 12. To find out disconnect the negative battery cable for around 8 hours. Any car battery stored for a long period of time will suffer self-discharge, even in moderate climates—so southerners with garage queens aren't exempt. The negative battery cable does need to be disconnected to flat tow your 2015 Ford Edge and it is because otherwise it would drain the battery. The reason is so that you cannot accidentally short out your wrench on the car. Or better yet disconnect both cables--make sure to label them first. How would you check the alternator for a bad diode. So, for about three weeks now I have been disconnecting the positive battery cable (since it's easier to get to) every nite and reconnecting it in the morning before going off to work. If the dashboard red 'bat' light is not on while the engine is running, it's not the volt reg or the alternator. The negative cable connects to the body ground already—so there's no additional danger if it rubs. Something you can try with a test light. That's if. And if you read any auto maintenance book, subject relating to 'electric', it advises to NEVER run engine with cables disconnected from the battery. Disconnect the negative battery cable c. The main reason for disconnecting the battery is to preserve the battery by avoiding a dischagred condition. Don't forget that disconnecting a car battery for any amount of time is likely to reset the engine computers to their default states - amoung other things this means that the tranmission shift points and diagnostics will need a run-in after the power is re-connected before everything is OK. I have a new die hard and its getting a good charge and battery cables are tight. Either cable disconnection assumes that you have a 10 mm metric socket and socket wrench available to you. (Vehicles with dual batteries, isolate main battery by disconnecting negative battery cable from secondary battery while performing parasitic draw test). If drain is still undetermined, remove fuses one at a time at the main fuse junction panel to find the problem circuit. Well, in my mind the same holds true for the disconnect switch. It can't do anything when it's not connected to the battery. I can't see how this would matter. ie, a test positive charge will repel it and a test negative charge will attract it. Oct 21, 2019 · How to Find a Parasitic Battery Drain. Very good guide, managed to replace my Huawei P10 battery in about 30 minutes. Ive been disconnecting the negative battery cable when I park it at work so I don't have to look for help getting a jump start. If everything checks out OK, reconnect the positive battery cable (or whichever isn't the system ground - usually negative is ground). It also removes all loads and leaks that will eventually destroy your battery. Then took the car for a 30min drive around town, A roads and a dual carriageway. When a battery cable goes bad, or a connection gets dirty, the effect is like an electrical traffic jam. Contact between the negative battery terminal and the battery, even if the cable is not clamped onto the battery, may reactivate the electrical system within the car. This can quickly discharge a battery and decrease its service life. Aug 08, 2008 · Obviously, it powers your pedals, but in most designs, connecting a jack to the DC input on the pedal also disconnects the battery, which means you can leave your pedal plugged in, and if by any chance your power supply breaks down (esp. HELP?: If after reading these instructions you don’t fully understand how to install your instrument(s), contact your local Stewart Warner distributor, or contact our Technical Support Team toll free at 1-866-797-7223 (SWP-RACE). Disconnect the ground wire from the battery and use an ammeter in the circuit, the current drain should be around 40-100 Ma. If this is not possible, batteries should be recharged periodically, every 20-45 days, until the green eye is visible. There shouldn't be much amps at all. Apr 29, 2017 · Given the corrosion on the positive terminal I'd want to check the negative cable-end at the battery terminal which requires battery or cowl removal to access *. It also removes all loads and leaks that will eventually destroy your battery. ) and may or may not be big enough to impact your project. It should not incur any degradation of voltage disconnected, especially if the time period is just overnight. Disconnecting the battery from the system will minimize the drain and a small maintenance charger can keep it at the ready for when you decide to fire it up. giving the full 12v nominal voltage. But, you may ask, doesn't an electric winch draw a lot of current?. Drain the engine cooling system 2. if the car battery cable is loose and the car is running, you may get far higher than that 15V at the cigar lighter. Step 5: Replace Negative Battery Cable. (3) Use an ohmmeter to test the resistance between the cable terminal (not the. Unfortunately it is not always easy to find the battery causing all the trouble. Loosen the 10 mm nut. By disconnecting the negative cable from the battery, the boat's electrical circuit is broken. Hemp, or industrial hemp, is a strain of the Cannabis sativa plant species that is grown specifically for the industrial uses of its derived products. Should I remove the battery completely or just disconnect and tape up the negative Stack Exchange Network Stack Exchange network consists of 175 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Will disconnecting neg. Here's a look at some symptoms that may indicate failing battery terminal ends and how to replace them. Great disconnect switch, inexpensive, and works perfectly on my old IH tractor. That's if. It can even cause the battery to explode. Before using the battery(s), check the electrolyte levels and state-of-charge. To drain a battery in three hours, the drain is going to be in the AMPs region, not Ma, which is unsual to say the least. Just disconnect the negative cable. I disconnected both battery negative cable and move them so they can't ground out or touch negative post Place 10 gauge wires with exposed wires between battery post and new terminal and push down to set on post nice and tight With alligator clip clip other end to negative cable which was removed from batter. While different batteries can have enormous capacities, eventually the headlights, heater, stereo, nav, and infotainment would all drain the battery of power. make sure your brake lights are not sticking on. Disconnect the connecting cables; Important: The cable which is connected to the negative terminal must be disconnected first. ) Do not have the charger connected to the battery or turned on at this stage. 147 Lockout/Tagout Requirements. Volt meter can be far from shunt, connected to shunt with ordinary small diameter twisted pair of wires. Vice versa for negative terminal. Great disconnect switch, inexpensive, and works perfectly on my old IH tractor. 3A Conclusion: Parasitic drain Watch a couple of youtube videos to see how to diagnose. Usually, when there is a problem with the battery cables, the vehicle will produce a few symptoms that can alert the driver that a problem has occurred and should be serviced. Can any current flow out of battery if negative cable disconnected? A lady at this apartment complex has an overnight voltage loss in her 1 year old battery. We recommend changing the battery in Dodges every 4 years. Tom over at EAS sent me another unit and now in order to properly remove and install the new unit I need to disconnect my battery, install the new DICE unit, touch the connectors to drain the power, and then reconnect the cables. Then unhook the other end of the negative cable (black) from the negative post (marked with a “–“ sign) of the booster car battery. Once you disconnect the negative terminal the battery is disconnected for practical purposes. But if you take the battery OUT of the vehicle, do not set it on concrete, the ground, or steel such as a steel plate. after several attemps to pinpoint the power loss( clean and tighten cablels)was able to verify negative cable as the problem. First, after running the engine, I always read about 11. If you still see now current draw, try charging your battery and then leaving it disconnected over night to see if it still draws down to 1V as you said. The BCM monitors current coming and going into the battery and also voltage at rest to determine the SOC. Very good guide, managed to replace my Huawei P10 battery in about 30 minutes. The photo on page XX shows the most common style of test switch. This looks normal to me. [Note: This "connect a test light in series with the battery post" is intended to help find a short ONLY when nothing is turned on. I ran welding cable from the positive and negative. I disconnected the negative cable from the battery. Jun 19, 2017 · This way, there is still no current flowing into the cables that may drain the functioning battery. This effectively puts your multimeter in the middle of the circuit - whatever current runs through your battery will run through the multimeter as well. So disconnecting the battery is crucial. Disconnecting the battery from the system will minimize the drain and a small maintenance charger can keep it at the ready for when you decide to fire it up. Step 3-Disconnect the negative (-) battery cable and install a parasitic load tool Step 4-Start the engine and drive the vehicle about 10 minutes, being sure to turn on all the lights and accessories including the radio Step 5-Turn the engine and all accessories off including the under hood light. It has a history of us coming back from extended trips and being dead. A stuck relay in the car can drain the battery. If you turn the key to the accessory position or depress the brake pedal within the one-minute time frame, you can also cause the problem. Jan 27, 2009 · You only need to disconnect one terminal of the battery to minimize battery drain while you are gone. I removed the top plastic part and now I can't figure out how to remove the plastic piece that is right over the battery (the part you connect the battery cover to). Clean any corrosion off of the battery and terminals with a can of spray-on battery cleaner. Step 5: Replace Negative Battery Cable. To clean the posts and terminals thoroughly, you will need either an adjustable wrench (left), or even better, a socket wrench (right,) to disconnect the terminal connectors from the posts. Still have lots of parasitic drain, probably from 1 or both of the 2 other positive battery cables. Mar 06, 2010 · It is always a very low draw so it doesn't run the battery down. Any car battery stored for a long period of time will suffer self-discharge, even in moderate climates—so southerners with garage queens aren't exempt. It is not necessary to disconnect the cables when adding water to liquid lead acid battery cells, but each time the batteries are serviced a thorough cleaning and inspection of the battery cable terminals should be performed. Re: Starter turns when hooking up battery (key not in ignition) This is a picture of your igntion switch. (3) Use an ohmmeter to test the resistance between the cable terminal (not the. However, I DID NOT have any way to duplicate the full test, as I didn't rig up a jumper cable to enable running the vehicle and then switching it to the meter - I just disconnected the negative battery cable and put my Fluke between the cable and the battery, closed the hood and locked the vehicle. Also disconnect the negative battery cable. The tractor has a "ghost battery drain" no one has been able to find in five years (Case/IH experts have searched). Shopsarahmac is one of the favourite online stores for buying Car Battery Terminals Not Working at much lower prices than you would pay if shopping on other similar services. Jumper cable instructions warn you to connect the negative cable at an engine location rather than the battery’s negative terminal. When you work on your car you rarely have to disconnect the battery. Make sure all electrical loads are off in the car, doors closed, and the key is out of the ignition switch. Heavy, Unpainted Metal Engine Part or Remote Negative (−) Terminal B. Next, remove the DMM lead from the positive battery terminal and touch it to the terminal on the disconnected negative battery cable. At least in this case, it appears that the electrical problems were related to the PCI Bus. if the battery is older, it will approx. I asume it is the alarm and radio causing this. Set your battery charger to the appropriate voltage and amperage. when disconnecting remember to remove the negative (black cable) first and then the positive (red cable). Failure to follow these precautions may cause personal injury and/or damage to the vehicle or its components. If the other vehicle does not have a 12-volt system with a negative ground, both vehicles can be damaged. Jul 11, 2008 · Negative battery wire and post getting hot - posted in Virtual Mechanic: Anyone have any ideas as to why my negative battery cable is getting so hot while the engine is running? Any help appreciated. "All vehicles shall be equipped with with a main battery disconnect switch. NEVER short a battery. Jeep recommends disconnecting the negative battery cable when flat towing to prevent the battery from draining. So, for about three weeks now I have been disconnecting the positive battery cable (since it's easier to get to) every nite and reconnecting it in the morning before going off to work. Disconnect the Battery. Just make sure the location where the battery and charger are is well ventilated, and disconnect the negative terminal first. V8 engine shown. Be careful not to touch the clamps of the negative cables (usually black) onto the red cables’ clamps, this may cause short-circuit that may damage both batteries. Any time you disconnect or remove the battery cables, it is recommended that you disconnect the negative (-) battery cable first. Our Mechanics Make House Calls. 4) Remove the negative and positive cables from the battery. net you will find the highest and lowest price for the items. Disconnecting battery. Apr 25, 2016 · Once the cover is removed, you'll see your battery. If your battery is reasonably good and you start / drive your vehicle reasonable distances every couple of days, it should hold. The video above shows you how to replace the battery in your 2014 Ford Fusion. Aftermarket alarm system. If there is not a battery disconnect switch one can be added, or, the negative cable to the "house" battery bank can be disconnected. No, it won't drain overnight if you disconnect the positive lead. Re: Howto disconnect battery bank Unless a system is more or less a toy, there should be either a breaker, easily removed fuse, and/or switch, (all properly rated for the DC voltages available of course) between the PV and controller. If you have a backup battery, and do not have voice service through Verizon, or if you do not need voice service during a power outage, you can disconnect the battery. My 2016 Ford Explorer Owners Manual instructions for flat towing include disconnecting the negative side of the battery. The capacity in watt-hours is equal to the capacity in ampere-hours multiplied by the battery voltage. Removing the old battery is the most difficult part by far, need to be firm yet gentle. Drain the cooling system 4. To disconnect a car battery, start by turning off the engine and opening the hood so you can access the battery. The affected area must be thoroughly rinsed with clean water and a physician must be consulted immediately. Drain the engine cooling system 2. Feb 05, 2016 · In this file photo, jumper cables are connected to a battery to jump start a car. * This post was edited 02/01/10 10:05pm by pianotuna *. Many times when cables are damaged, people are tempted to install bolt on battery terminal ends. The test light will glow or "light" if there is a drain. Re: Disconnect cable prevent battery drain ? I've always read that a lead acid battery will naturally loose voltage over time, some say that even while not hooked up the losses can be from 40 to 50% over the course of a year, older batteries even more, so I always take them off for winter storage if I don't have a battery tender on them. In some cars, especially those made before the mid-1990s, you can reset the check engine light by disconnecting the battery. This drain rate varies according to the battery technology (lead acid, lithium, etc. Dell XPS 15 owners are complaining about overheating and battery drain caused by the laptop's Modern Standby Mode. As a bit of clarification, you don't disconnect the cable from the battery, you disconnect the cable from the car body which is just a very short distance from the battery. The Big Switch is a heavy-duty battery kill switch that complies with OSHA 1910. Skip the Repair Shop. If your vehicle has negative ground, the positive cable goes back first. did you have the negative terminal disconnected from the battery when you were measuring current? And also, it sounds like you had the ammeter hooked up backwards. Before we begin to explain battery float chargers, we should discuss how a conventional (simple) battery charger works. I disconnected the negative cable from the battery. Remove the fuse and connect the test light across the terminals of the fuse socket. I purchased a terminal battery cleaner and cleaned up both the cable ends and battery ends pretty good. The freezing point of the battery electrolyte becomes lower the more fully the battery is charged (I've found many different numbers for freezing point of a fully charged battery, and you can too), and even disconnected the battery will self-discharge (increasing the risk of freezing). First clean the top of the battery and any corrosion from the cables using a tablespoon of baking soda, a cup of water and a nonmetallic brush. 8 volts steady all the time unless I let it sit with the 2. I see that removing the negative terminal is always recommended when working on your car audio. Electrical disconnect switches have several important jobs in commercial vehicles and equipment. if the battery is older, it will approx. Release latches on air cleaner canister cover (D). You only need to disconnect one terminal of the battery to minimize battery drain while you are gone. Any current draw over 600-800 milli-amps indicates an excessive drain on the system. ) Make sure it stays connected at all times. Oct 22, 2019 · To disconnect a car battery, start by turning off the engine and opening the hood so you can access the battery. Undo the battery cables. We recommend changing the battery in Fords every 4 years. Any ideas on a good way to trace the problem down would help. If your battery is reasonably good and you start / drive your vehicle reasonable distances every couple of days, it should hold. It should not incur any degradation of voltage disconnected, especially if the time period is just overnight. The battery cable should be a minimum of 2-gauge wire. My car is now a fire hazard and can't be driven. Don’t cut corners by connecting both the positive and negative cables at the same time. It's a 10mm socket to disconnect the battery. First turn the engine off and remove the cover from the battery. Now that you have the issue/s fixed, you can remove the zip-ties/clamps from the multimeter leads and replace your negative battery cable. However, I DID NOT have any way to duplicate the full test, as I didn't rig up a jumper cable to enable running the vehicle and then switching it to the meter - I just disconnected the negative battery cable and put my Fluke between the cable and the battery, closed the hood and locked the vehicle. Negative first. Flush with cool water. To remedy the problem, first remove the cables or wiring from your battery noting the following: You will want to disconnect the negative terminal first, then the positive terminal. Always disconnect the negative battery cable to be on the safe side. An alternator charges the battery while the vehicle is running by turning mechanical energy from a spinning pulley into current. SiC devices are complicated because they require a gate drive that can go negative, which generally entails some sort of charge pump or isolated supply to generate the negative rail. also if I use a battery booster pack on the battery I hear a small thunking noise and. To disconnect a car battery, start by turning off the engine and opening the hood so you can access the battery. Disconnect the home button and drain stops so it's either Touch ID or something to do with the home button. Unfortunately it is not always easy to find the battery causing all the trouble. If you suspect further problems, you can also opt for troubleshooting, using simple steps: Have your car battery checked by a reliable auto-parts store expert. S6 Battery Drain After Nougat Update. Tie the cables back while you work on the battery. terminal on battery stop all parasitic draws if car to sit for a few days? So I have a battery that has been dying on me after sitting for 3 days or so, since I work at home. Disconnect negative (-) battery cable (A). If you are disconnecting the battery, there would be no drain on it. Your Negative Battery Cable is connected directly to ground on your cars frame. It provides the ground or return path to the battery so that all of the electrical circuits have a "pure" ground path to the battery. How to Go About Disconnecting Your Battery. You turn the ignition switch and get nothing. The gateway can be in two locations on the Golf. Either cable disconnection assumes that you have a 10 mm metric socket and socket wrench available to you. It also removes all loads and leaks that will eventually destroy your battery. So, the battery drain can't be from the brakes, lights, turn signals, etc. Any time you disconnect or remove the battery cables, it is recommended that you disconnect the negative (-) battery cable first. High resistance can form in the clamped together joint. battery through a key switch and/or start button to the coil of the magnetic switch and back to the battery. The negative cable is black with a (-) symbol and is hooked up second. Think of them as similar to circuit protection devices, but instead of terminating connection when voltage spikes, they disconnect when voltage drops too low, preventing damage to the batteries and load. So be safe, and connect it to a metal part of the engine’s casing, such as the engine mounts or the chassis. Two wires together that are the 12v DC positive and negative wires from the converter for charging the battery. S6 Battery Drain After Nougat Update. However, I DID NOT have any way to duplicate the full test, as I didn't rig up a jumper cable to enable running the vehicle and then switching it to the meter - I just disconnected the negative battery cable and put my Fluke between the cable and the battery, closed the hood and locked the vehicle. Still have lots of parasitic drain, probably from 1 or both of the 2 other positive battery cables. Here's how you can mount this car battery switch: Step 1: Unhook the negative battery cable from the battery. Leaving a battery connected in a vehicle can also increase the discharge of battery due to the additional parasitic (ignition key-off) load. Remove the fitting. A conventional charger works by supplying a constant DC (direct current) or pulsed DC power source to a battery being charged. Connect a jumper wire from the alternator output terminal to one of the 3/16. Battery DOCTOR® battery disconnects mount on the negative battery side that make disconnecting and reconnecting the battery quick and easy. This is a normal process with all lead acid batteries. V8 engine shown. AGM and Gel Cell battery cable terminals should be maintained at least one time per month while the RV is in use. Disconnect the negative (black) battery cable from the battery. Before using the battery(s), check the electrolyte levels and state-of-charge. no battery current -no drain. But, as was previously suggested, only do that when you are keeping an eye on the car. What can cause a car battery to drain? Over time, we came across many problems where a car battery would drain quickly, sometimes even overnight. There is a way to provide a maintenance charge to the battery but it will not charge up the battery and the battery could still drain. Connect POSITIVE (RED) clip to vehicle chassis or engine block away from battery. If the drain is not caused by a vehicle lamp, remove the fuses from the interior fuse junction panel, one at a time, until the cause of the drain is located. [Quick lesson to check for a battery draining power (aka "parasidic draw") when the car is off - by disconnecting the negative battery cable from the negative battery terminal, then hooking up a 12 volt bulb between the disconnected negative battery cable and the negative battery terminal with all switches and all electric turned off including. Remove the battery cover. Not good for the alternator. This is a discussion on negative cable on alternator within the General Help forums, part of the LSx Technical Help Section category; does there need to be a cable from the negative battery terminal to the back of the alternator??? mine has. (Disconnect the cable from the terminal and connect the positive probe to the battery positive terminal and the black probe to the battery cable. when disconnecting a jumper cable. What can cause a car battery to drain? Over time, we came across many problems where a car battery would drain quickly, sometimes even overnight. Or you can pull the negative cable, pull the positive cable, put a ampmeter between the positive cable and the positive post, and put the negative cable back. The typical quick fix is to fully charge the battery and, if necessary, briefly disconnect the negative battery cable, which will reset the vehicle computers. Can I add a battery cut off switch to the negative side and kill everything or is that not recommended with certain components like levelers and slideouts?. * This post was edited 02/01/10 10:05pm by pianotuna *. if you have an aftermarket alternator, disconnect the power wire. It should be seated down on the terminal as far as possible. Disconnect the black negative (−) cable from the vehicle that had the dead. The positive cable is hooked up first and can be identified by its red color and a (+) symbol. Plug in the charger to a wall socket and you are ready to stay charged!. Cables should be first connected to the donor vehicle’s battery and then to the dead battery. Connect a battery cable from the starter or starter solenoid to one of the 1/2” switch terminals. Battery disconnect switches can help preserve battery life and prevent theft or tampering.