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911 911 is offline
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Battery does not hold a charge...

My mom's '86 Carrera is not holding a charge in the battery.

Brief background: She had the battery replaced a few months ago. I checked the readings/charge today and it was only at a 3.1. The alternator was replaced about 5k miles ago, so I'm inclined to believe that the regulator is probably faulty here.

Am I missing anything else, or something that's fairly obvious? Any help would be appreciated it. Thanks, guys.

Rich

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Rich Mitsuda

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Old 11-30-2004, 02:34 PM
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One thing I forgot to mention is that one of the cables wasn't tightened down all the way. It was on, mind you, but I could easily detach it form the battery terminal. Could this be the culprit? Thanks, again.
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Rich Mitsuda

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Old 11-30-2004, 02:43 PM
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Yes, a loose connector can cause enough of a Voltage drop to prevent a battery from getting a full charge.

Clean both posts and the connectors with a wire brush-type cleaning tool, and charge the battery overnight [still disconnected from the car] with a 10 - 15 Amp charger. Check the open-circuit Voltage of the charged battery an hour or more after removing the charger. If the Voltage isn't around 13.0 Volts, there may be a problem with the battery, and it probably should be checked at a shop or auto parts store.

If the battery tests OK, apply silicone grease to the posts. Re-install the terminals and start the car to test the battery.
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Warren Hall, Jr.

1973 911S Targa ... 'Annie'
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Old 11-30-2004, 03:25 PM
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Thanks, Warren! I will try that and hopefully that will be the cure.
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Rich Mitsuda

2007 997.1 GT3
2022 Audi Q3
2005 MINI Cooper S
Old 11-30-2004, 05:38 PM
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Quote:
Originally posted by Early_S_Man


If the battery tests OK, apply silicone grease to the posts. Re-install the terminals and start the car to test the battery.
Warren, I am curious.

Do you mean to apply silicon grease to the electrical posts themselves? Or around the posts?

I have always been putting them around the posts for corrosion and moisture resistance...

Thanks
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Nick
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Old 11-30-2004, 05:56 PM
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I've always used vasoline (didn't think it would hurt plastic). Once had a ground wire that looked alright on the outside, but bad corrosion had worked its way up a foot after peeling the sleeve.
Old 11-30-2004, 07:04 PM
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I've been told 12.2V is about as low as lead-acid batteries like to be. If it's 3V at the terminals it's prbably dead, no reviving.
Old 11-30-2004, 07:23 PM
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Thanks for the info, John. It's a good thing there's a warranty on the battery if that's the case.
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Rich Mitsuda

2007 997.1 GT3
2022 Audi Q3
2005 MINI Cooper S
Old 11-30-2004, 07:42 PM
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And don't forget to check the obvious battery drains. I have on a couple of ocassions bumped one of the overhead interior lights to the "always on" position and in my lighted garage never noticed it was on when I shut the door.

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Kurt V
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Old 12-01-2004, 05:57 AM
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