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Battery Won't Stay Charged

2 messages,  Last post on Sep 22, 2009 at 2:56 PM

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#1 of 2 Battery Won't Stay Charged by eric_133 Sep 22, 2009 (2:29 pm)
I'm not real smart when it comes to fixing a car but here is the problem at hand:   My 1995 Pontiac Bonneville won't keep a charge to the battery. I can jump start the car and it seems like it will run fine, but when you shut it off and try to restart the car it just clicks as if theres no power at the battery. So far I've replaced the battery and the altenator. The new battery in the car lasted about 2-3 days before draining. Replacing the altenator made little to no difference at all being it won't start. Does anybody have any suggestions on what they would try next? Replies to this message: imidazol97 (Sep 22, 2009 2:56 pm)
#2 of 2 Re: Battery Won't Stay Charged [eric_133] by imidazol97 Sep 22, 2009 (2:56 pm)
Replying to: eric_133 (Sep 22, 2009 2:29 pm) Could be a starter problem. It might be draining the battery occasionally. You need to disconnect the battery cable and put in a device to measure amperes of drain. Then see how many milliamperes of drain are there. the number .03 amp comes to mind but search to find what normal draw is for the computer and systems in the car.   If it's high then start pulling fuses one at a time to see which one cures the draw. Don't forget the maxifuses in the relay center on the firewall.   But I keep thinking there was something about a wire to the alternator on certain years that was needed so the alternator would charge properly. You might search for that on the internet. I don't know if it's your year, but it was something about the charging was supposed to be controlle through the computer, but a direct wire from somewhere was needed to the alternator so it would sense the charge needed. Verify all this because I'm operating on a long ago memory and don't have time to search for info for you.   A good check would be does the battery charge when you run the car after getting it started? It should show 12.6 v. car stopped. Then show 14.5 and higher when you start it.

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