Volts going a little high? - Team Camaro Tech
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post #1 of 9 (permalink) Old Apr 24th, 13, 10:30 AM Thread Starter
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Volts going a little high?

I have not driven my car since November. i pulled the motor out and did some clean up work/maint. on the engine and under hood over the winter. I have an internally reg. alternator and a yellow top Optima battery. I got the car back together and drove it yesterday for the first time and the volts went up to about 15.2 cruising around town at about 40mph. I did charge the batter a couple of times over winter while not being used. Is the battery just at low charge and causing the volts to go higher or ???

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post #2 of 9 (permalink) Old Apr 24th, 13, 10:38 AM
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Re: Volts going a little high?

It may, plus there maybe a corroded connection in the alt wiring.
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post #3 of 9 (permalink) Old Apr 24th, 13, 10:45 AM Thread Starter
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Re: Volts going a little high?

Thanks for the quick reply! I am a little nervous as I had a bad experience once before where the internal reg. was bad and volts were spiking blowing both my digital dash and MSD box at the same time and it happened to me twice before i figured out it was the reg. So I just want to make sure i'm not heading that same direction again...

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post #4 of 9 (permalink) Old Apr 24th, 13, 11:59 AM
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Re: Volts going a little high?

15v is a tad high, it could start to cook the battery.

The battery is designed to charge @13.8v.

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post #5 of 9 (permalink) Old Apr 24th, 13, 12:03 PM Thread Starter
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Re: Volts going a little high?

Just drove it around some more. The volts are coming down the more I drive it. Down around 14.3 or so while driving.

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post #6 of 9 (permalink) Old Apr 24th, 13, 12:29 PM
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Re: Volts going a little high?

Have you compared the voltage indicated on your on board volt meter with a known good/accurate volt meter to verify it's accuracy?

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post #7 of 9 (permalink) Old Apr 24th, 13, 01:59 PM
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Re: Volts going a little high?

To verify that your battery is not in constant demand, get a simple battery hydrometer tester and check acid gravity on each cell, you may find the charge of the electrolyte is down. Simpe battery testor, I think I got mine at Harbor Freight. If the battery is one of the dry types, you got me there.

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post #8 of 9 (permalink) Old Apr 24th, 13, 08:10 PM
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Re: Volts going a little high?

Quote:
To verify that your battery is not in constant demand, get a simple battery hydrometer tester and check acid gravity on each cell, you may find the charge of the electrolyte is down.
Not with Optima. It is AGM. Your 14.3 is about right I think. You were probably a little discharged.

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post #9 of 9 (permalink) Old Apr 24th, 13, 09:56 PM Thread Starter
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Re: Volts going a little high?

Yeah, I drove it quite a bit today and it is pretty much leveling off around 14.1-14.3 while driving and lowers at idle, not fluctuating to much under load anymore so I feel good about it now.

Thanks for the replies!

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