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10-12-2012
Ok to start its not my car, it belongs to a girl I like. It wont hold a charge, if it sits for like an hour or more the battery dies. Its a 1995 pontiac grand prix se, its got a new battery and alternator. I have no clue what's wrong with it, I do body work and under car care, n some small wiring jobs (speakers, amps, bypassing the ignition so it starts like a race car lol) but nothing like this, only doing it to impress her. So any help at all will mean a lot to me. Thanks in advance.
10-12-2012
Check Grounds.
Make sure nothing is staying on when the car is shut off.
10-12-2012
Unless it's her staying on....giggityOriginally Posted by Fivefingerdeathpunch
For real though what he said.
10-12-2012
you need a volt tester, test the battery with the cables un hooked, note the volts. should be 12 volts or a bit higher. then hook the cables back up, car off, see if its the same, should be real close. then start the car and test again, it should be showing at least 13 volts or more, but you dont want it to more then 14.
if the volts drop, car off and cables back on, you have a parasitic draw somewhere killing the battery, after market radio hooked up to constant power, or something else.
10-12-2012
Check battery cables for corrosion as well.
10-13-2012
Thanks, I didn't even think of checking the volts. And TexasTanker only if it was her staying on lol
10-13-2012
Voltage would only work if you had a quality DMM that was able to check to quite a few digits.
Other methods involve measuring current while the vehicle is off. Be sure you know how to use an Ammeter. 50 mA or less is typical for older cars with basic security. Some more advanced vehicles can draw upwards of 200 mA.
If you see a large draw, its time to play, pull the fuses and measure current. A tedious game that no one enjoys.
10-21-2012
goto scottykilmer.com. he has a video on this very subject. the video tells how to find a battery drain.
10-22-2012
Easiest way to start off is charge the battery and unhook it. Walk away for a couple hours as it appears to die quickly from your description. If you come back and the battery is dead w/o being hooked up, it's a bad battery. This does happen.
If you still have a charge, then start the draw testing.
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