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I have the same problem now. I found, so far, that the glove compartment was not closing properly and the light was staying on draining the battery. The battery may also be in borderline condition.%DETAILS

AnswerI had the same problem a few years ago with an '83 Buick. The problem was in the computer, and I had to have it replaced. You've definitely got a short somewhere. Sometimes you can take a volt meter that will measure a drop in voltage, you can hook it to the battery, and then start pulling fuses one by one. When you pull the fuse on the grounded circuit you'll see a voltage increase at the battery. When you plug it back in you'll get a voltage drop. At least that way you can isolate the circuit. If it's in the computer though you may not see a drop at all in any of the circuits. Answerhello

The battery is discharging because one or more of the accessories is staying on even after you have remove the key.

One of the easiest ways to find the problem is to disconnect the negative battery cable and connect a 12 volt test light between the negative battery pole and the negative battery cable. Check to see if the light is ON. If yes. pull out each fuse one by one and check to see if the test light goes out. when it does go out you have almost found your problem. it could be in the wiring or it could be the accessory.

you outsee ya

AnswerCheck for a short in the alternator. AnswerThe light in the trunk or under the hood has a level sensitive switch. If this switch is not working it will leave the light on. AnswerThe rear window defroster stayed on constantly on my Merc.I tested it by pulling fuses one at a time with the engine off and looking for a small spark.
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Q: Why would the battery discharge when the car is off on a 1984 Mercury Marquise?
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No, a car battery does not have mercury in it. It would be very dangerous to have mercury in a car battery.


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It typically indicates that the alternator has failed and is no longer charging the battery. Once that happens, the battery will slowly discharge and the vehicle will no longer start. The battery is simply an electrical storage device and if the alternator is unable to replace the electrical energy used LAST time the vehicle started, the battery will discharge. Automotive batteries are not designed for "deep discharge", meaning that if you allow your battery to discharge too much you are causing harm. Once the warning light comes on it would be wise for you to take care of the problem as soon as possible.


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What would make a car discharge besides the battery and alternator?

All of a vehicle's electicity using devices drain/discharge the battery, but during the time the engine is running, the alternaror is supposed to keep the battery recharged. If the engine IS running, but the alternator is NOT providing enough current to recharge the battery then ALL of the electricity using devices discharge the battery. Some of the "onboard" computers draw some slight amount of power even when the ignition switch is off, but they do not use enough power by themselves to significantly discharge the vehicle battery. Any electricity using device which SHOULD be turned off when the ignition is off, BUT... which due to some fault [such as a "stuck" relay for example] that keeps that device still turned on when the engine is not running and the key is off will also discharge the battery. Or, just leaving the ignition switch on without the engine running, or the headlights or parking lights on, or sound equipment left on will contribute to discharge of a vehicle's battery.


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Because whoever told you that a low battery would cause hard steering is an idiot.


What would cause the battery to not charge even when the alternator tests good on a 93 Mercury Cougar?

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What would cause the battery light to constantly stay on on a 1997 Mercury Sable?

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Would a bad alternator on a 1999 Grand Cherokee Jeep Limited keep discharging a brand new battery?

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