Killing batteries

Killing batteries

Postby Horrible_North [OP] » July 28th 2020, 2:58pm

Ok, so, I'm at a loss. Hope you guys can point me in the right direction. I have a 94 AWD astro. I had a fan clutch go bad so while I had all that out I decided to put in a new alternator. Once I got everything put together and fired up I had it running for probably 45 minutes to get the air out of the lines. Then I shut it off and it sat for a hour or so. After that it had a dead battery for some reason so I tried to jump start it. With it hooked up I only sometimes would get even interior lights. I took the battery to get tested and it was shot (it's a 6 month old optima). Took a backup battery and tried that. It's shot now too. Alternator tests out fine. Could it be my starter shorting out? I also checked the positive wire for a short but it looks fine. Any advice would be greatly appreciated.
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Re: Killing batteries

Postby markmitch » July 28th 2020, 3:27pm

is it possible the new alternator is over charging the battery/s
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Re: Killing batteries

Postby Horrible_North [OP] » July 29th 2020, 1:34am

I don't think so. I put in that backup battery and it killed it too without ever starting.
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Re: Killing batteries

Postby Sailing_Faith » July 31st 2020, 8:16pm

I would be less suspicious of overcharging then under charging.

What charging voltage are you seeing at the battery while running? Have you cleaned or replaced the charge cable to the alternator?

New battery and alternator won’t fix a bad connection on the charge wire... (you might search for and perform the “big three upgrade” listed on this site.
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Re: Killing batteries

Postby Mmusicman » August 1st 2020, 1:15pm

Stop guessing.
Time to whip out a meter and start checking a few things.
Also look over the wiring and connections for physical issues.
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Re: Killing batteries

Postby Old Barney » August 1st 2020, 3:13pm

When installing the battery terminal on the battery was there any sparking? You need an amp meter to install between the battery and the cable to see if there is current flow. the new alternator even new may have a bad diode and draining the batteries.
Without a good meter and knowledge on its use your spinning your wheels and got going any place.
Check again the red wire connection on the back of your new alternator. Make sure when you tightened the nut the wire terminal didn't touch (short out) on the alternator case.
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