Question about 1989 Pontiac Firebird

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Battery keeps dying. alternator good

I have an 89 firebird 2.8l v-6. I replaced my battery and had the alternator tested. it passed. But the battery keeps draining. What else could be causing this?

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  • Daniel Neaman Feb 25, 2009

    I haven't installed anything new. All my lights are off when the car is off. I checked my connections in the charging system. They are all good. I tried the the alternator test where you pull the negative cable and the car stalls. the only other thing is the serpentine belt is loose. I'm going to replace that and then see.

  • Daniel Neaman Feb 26, 2009

    I replaced the belt no go. gonna pull the alternator again. thanks

  • Daniel Neaman Feb 26, 2009

    The alternator tests fine. Maybe the voltage regulator?

  • Daniel Neaman Feb 27, 2009

    Thats what I thought too. guy at the auto parts store said they have one for it. Now i'm gonna check the wires from alt to fuse box. diagram says there is a wire that runs there. next wiring harness. if not i'm blowimg it up.


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Its definitly something taking power ,have you install something new lately,car stereo,amp,if not could be just car trunk light,under hood light,stays on.things to check

Posted on Feb 25, 2009

  • carhob Feb 25, 2009

    if you pull the batt. cable off without it touching anything and its stalls.....! better have alt.checked again,if its good car wont stall

  • carhob Feb 26, 2009

    volt reg. is built in alt.put alt.b ackin car, start car getreading with voltmeter at batt.13-15vlt if not system not charging,check circuit,if yes turn hradlights on if goes below weak system,alt.or bad connection or wire in circuit,if its ok,refer to first solution.if its 2time i send this comment sorry,was not sure if other 1 was sent.


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Im having same problem..v/r is regulated by a comp in the dash cluster i was like to know if i can bypass this by installing v/r

Posted on Jun 17, 2013

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