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My 77 coupe deville keeps draining the battery.i

My 77 coupe deville keeps draining the battery.i got new battery I got new battery post .i did not change the alternator because when I take the - cable of the battery my car stays on..can someone please help

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  • Cars & Trucks Master
  • 21,873 Answers

To begin with, please don't ever disconnect the battery cable with the engine running. You can cook the alternator and the computer.
Have you pulled the fuses and disconnected everything to check for a drain ?

Posted on Apr 30, 2013

  • 1 more comment 
  • Frank rosado May 01, 2013

    No I have not taken any fuses out..nd I won't do that again.i just thought that was one way to see if the alternator worked.but I won't do it again..could it be the battery is a valuecraft from auto zone.is my 3rd battery.

  •  Stephen
    Stephen May 02, 2013

    I would have the battery and alternator tested on the car. If both check out ok, you will have to pull the fuses and disconnect the major circuits to find the drain.

  • Frank rosado May 03, 2013

    It was a fuse......thank you so much u guys ....

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GM Elec
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SOURCE: Battery and Alternator Good. Alternator not working. HELP!!!

djn, I believe you have some accessory that is on when the key is in the off position.
Check to make certain glove box light is not on when the glove box door is closed and the trunk light is not on.
If you have an aftermarket radio or any added accessories make sure they are not wired direct to battery voltage.
If all that checks out, disconnect the battery negative and connect a test light between the battery and battery cable. If the light is on you have a drain in the electrical system. Leave the light connected and begin removing 1 fuse at a time until the light goes out, that will tell you what component or circuit is draining the battery.
Last resort, you may have an alternator drawing the battery down.
Good luck and let me know.
Regards,

Posted on Mar 01, 2009

SOURCE: My car battery keeps getting

You need to put an AMP Meter in series with either battery cable, and then look for a circuit not timing out,after you remove the key.
May take 20 minutes.
Anything over 40 Milli-Amps is too much
Start pulling fuses one at a time, to find circuit, then you need a wiring schematic of complete vehicle to find problem.

I always purchase shop manuals and wire diagrams, as soon as I buy a new vehicle. Will need owners manual -for fuses.

Posted on Sep 29, 2010

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