Car Batteries

Which side of battery do you disconnect to stop the battery running down in a vehicle not being used for a while?


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2012-08-04 17:47:35
2012-08-04 17:47:35

Disconnect the negative cable.

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Possibly a bad alternator. The Alternator charges the battery when the vehicle is running. If the battery is not being charged this could cause the vehicle not to start.

Best to unplug it and then disconnect it from the battery. Reason being is that if you disconnect it from the battery first you will create a spark. That spark could ignite any fumes from the battery.

From your description it sounds as if the warning light is operating correctly. When the engine is running the battery is being charged and the electrical needs of the vehicle are being fully met by the alternator's output and the battery is not expending stored power. When you turn the engine off the alternator stops running and anything in the vehicle that requires electircal power is suddenly dependent upon the battery to supply it. Thus, the battery begins discharging power, which triggers the warning light indicating that the battery is being discharged.

Ignition off, hook a battery charger to the battery post and let it charge. Black - Red + Disconnect the charger before starting the vehicle. You do not have to remove the cables nor take the battery out of the vehicle. Batteries are constantly being charged on the vehicle with the alternator. That is just unnecessary work for nothing. Since the battery is in the fender, you hook the battery charger to the jump start posts under the hood.

Your alternator has failed, and the battery has drained from running the vehicle without being able to recharge it. Replace the alternator and the battery should be fine.

This could be because you didn't disconnect it before you started pulling it.When you tow a vehicle, you should turn the key to 'on' so that the wheel can turn to allow the vehicle to follow the lead vehicle.

If your engine is running , and the battery light comes on , that indicates that your battery is not being charged

Something is causing a drain on the battery even with the vehicle off and nothing turned on. A good mechanic can do a drain test on the battery to see what may be draining the charge. A dead cell in the battery itself will also cause the battery to go dead. Disconnect the negative battery cable overnight and if the battery is dead the next morning it has a dead cell and must be replaced. If not look for a light that is on or a relay that is stuck.

That light doesn't mean that your battery needs to be replaced. It means that your battery is not being charged while the car is running. Have your alternator tested.

Out of gas versus dead batteryRunning out of gas in and of itself would have absolutely nothing to do with a dead battery.On the other hand, IF someone, not realizing that the gas tank was empty, were to continuously crank, and crank, and crank the engine erroneously thinking they could get the engine to start, then it is for certain that they will drain the charge from the battery and thus "kill" the battery.It's not the being "out of gas" that kills the battery, but the vehicle operator that kills a battery.

If your alternator stops working you are powering the vehicle on your battery and your battery is not being charged by your faulty alternator so eventually as the battery drains down the car will stop running. Avoid using any electrical, power windows ect and get your alternator repaired immediatley.

Most likely cable running from stud on top of alternator to battery terminal is corroded or broken.

simple useful alternator test - with the car running at idle and no accessories, lights, etc. on. Disconnect your positive battery cable. the car should stay running if your alternator is functioning correctly. If it is, leave your battery disconnected from the alternator for the night, or for however long it has been taking to drain the battery. Reconnect in the morning and try to start it. Often alternators fail because a strain is being imposed on them by a battery short. It's good to replace both at the same time.

If you do it wrong, there is a possibility. Connect the positive side first, connect the ground to the vehicle chassis on the vehicle being jump started, rather than the battery negative. After starting, disconnect the ground side first, and ensure that the electrodes do not make contact or come close enough to arc.

Yes. If you disconnect the battery from the vehicle what happens is that the anti theft system on the radio thinks the the radio is being stolen because it loses power. What you have to do is enter a code that is provided to you by the dealership. If they don't have the code on record then the dealer has to remove the radio to find out the code.

In order to jump start a vehicle one will require jumper cables. The cables are then attached with the red cable being clamped onto the positive terminal of the car with the dead battery and the car that is providing the boost. The black clamp is placed on the negative terminal of the car that is boosting and the other end is connected to any unpainted metal surface in the engine compartment of the dead car. The car providing the boost is then started and once the boosting car is started one can start the vehicle needing the boost. Leave the vehicle running and disconnect the cables.

Also happened to my '93 when I changed the battery. I believe I just cycled through the alarm set buttons on the key fob. ADDITION>>>Jump starting with a DEAD battery and the factory security system is a no go. You can do it with a WEAK battery but not a dead one... Replace the battery. OR try charging it IF it will hold a charge. But when you jumpstart it, the security system will activate when you disconnect the cables. Chrysler's engineers thought this was a good way to keep the vehicle from being stolen when the battery was removed to disable the vehicle, as normally you can simply remove the battery from a running vehicle without stalling it as long as you dont short out the positive cable. I was flabbergasted to find out that this was an intentional design precept.

Has the battery been tested, does the alternator on the Durango try to charge?... If the truck runs with the battery but the battery doesn't take or hold a charge, it has to be the battery being bad or extremely bad terminals so that the charge can't reach the battery. Age of the battery doesn't matter, a fairly new one can still go bad.

other than being sufficiently strong for the task, nothing that i know of. i would worry more about not running the towed vehicle into the towing vehicle and that the towed vehicle has brake lights though.

A dead cell in the battery will cause this. Also, any light that is on pulling power from the battery. Another possibility is a stuck relay.

no the car wont start because the battery is dead, it was discharged by running it and not being recarged by the alt

It really depends on if your anti-lock brakes are functioning correctly. If they are not then that is why the light is on, so bring it to a brake specialist. Otherwise, if you know they are working properly then disconnect the black cable on your battery with a socket, or wrench being careful not to touch both poles on the battery terminal with anything metallic. Keep battery cable disconnected for a good minute or two then reconnect. Enter vehicle turn key to ACC, or the one right before you start it; wait 10 seconds then start the vehicle.

If you're absolutely certain that the battery is ok (have it tested) and that nothing is being left on and that the key is turning off properly, it's time to have the alternator tested. Sometimes an internal diode can fail which will end up draining the battery. But don't just replace the alternator. Take the vehicle to your local auto parts retailer and have them test it for you IN CIRCUIT! Meaning that they'll test it with the vehicle running. They should be able to determine if the alternator diode has shorted.

Could be, the engine is seized, the starter is bad, dirty or loose battery connections, battery in vehicle being jumped is stone dead.

Usually a pulsing lights means that some component in the charging system is not working right. Probably the alternator, but it could also be a bad battery that is not holding enough charge. Always check the battery and alternator connections first to eliminate corroded or loose connections. The alternator should run everything with out being connected to the battery while running. Start the truck and then disconnect the negative cable if the truck dies then the alternator is going bad or has bad connections. I aways replace the battery and the alternator together. That leaves me no guess work later. Good luck.

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