Question about 1989 Pontiac Firebird

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Battery and Alternator Good. Alternator not working. HELP!!!

I have an 89 Pontiac Firebird 2.8l. I have replaced the battery, the battery cables, had the alternator tested 9 times, and the battery keeps draining. Also when I take the negative cable off the car stalls. Usually a bad alternator. Nope its still good. The alternator is not charging the battery or working at all. Need Help Please!!!!!!!!!

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  • Daniel Neaman Mar 01, 2009

    that battery goes dead in about a day right after fully charged.

  • Daniel Neaman Mar 02, 2009

    Well I decided to have the alternator tested again after checking all the wiring. Some of the people at AUTO ZONE don't know how to run a simple test on their own testing machines. My alternator was bad. Failed the test three times. Put new one in car runs fine. Thanks to both of you for the help. I've been working on cars since I was a kid and was very perplexed when the alternator tested good. Next time I'm going to NAPA. LOL Thanks again.

  • Bruce Bracey
    Bruce Bracey May 11, 2010

    How long does it take the battery to go dead, 1 day or more?

    Let me know.

    Regards,

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  • Pontiac Master
  • 1,000 Answers

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

  • dustin
    dustin Mar 03, 2014

    i have an aftermarket radio while i jumped the car last night the power to radio would make the light on the radio come on then go off hhthen come back on car dyed so i left it sit over night today it started right up and have no power what so ever to the radio

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  • Contributor
  • 8 Answers

I would see if the wires to the plug going to the alternator are putting out any juice or the hot wire that connects to the back is getting juice.

Posted on Mar 01, 2009

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