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> Crazy Battery Charging Problem - HELP!
customstarr
post May 4 2007, 08:25 PM
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Ok... heres a good one: I've had my car for about three months - most of the time it's been in storage - never once lost a charge during the cold winter - even after sitting for weeks without starting. Last week, I brought it home from storage and started some detail cleaning on it - everything was fine.

Then, while driving it, it seemed the FI was messing up - just wasn't running that great. I get home, go to restart it and the battery is DEAD.

The PO put the wrong battery in it anyway, so I went and purchased a brand new battery today. I put it in, the car fires up and runs great - for a minute - then it seems like its acting up again. I shut it down, try to restart, and the BRAND NEW BATTERY IS DEAD.

Here's the kicker: My GEN light works - comes on during key up, but does not stay illuminated while running. How could a brand new battery get immediately drained after running for just a few minutes unless the ALT is bad - but then again, why am I getting no GEN light?

PLEASE HELP! Possible Voltage Reg problem?
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pbanders
post May 5 2007, 08:58 AM
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Two things - first, as DD said, you have to make sure the battery is fully charged before you install it. The only way to reliably do this is to either use a manual charger and measure the specific gravity of the water/acid, or to use an automatic charger.

Second - your fully charged battery should read 12.75 V with a DMM. Not 12 V, not 12.2 V, not even 12 V, it's got to read 12.75 V. If it reads less, then it's not fully charged. To measure this correctly, you must first remove the surface charge - do that by turning on the lights for 10 minutes before measuring across the battery posts with your DMM.
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Posts in this topic
customstarr   Crazy Battery Charging Problem - HELP!   May 4 2007, 08:25 PM
SirAndy   PLEASE HELP! Possible Voltage Reg problem? ...   May 4 2007, 08:31 PM
So.Cal.914   Even if it is putting out nothing at all it should...   May 4 2007, 08:38 PM
scotty b   If the alternator had reversed it's polarity (...   May 4 2007, 08:40 PM
So.Cal.914   B)-->

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