72 Chevelle battery very hot - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

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post #1 of 11 (permalink) Old Aug 24th, 19, 9:30 AM Thread Starter
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Brian
 
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72 Chevelle battery very hot

Just drove 1.5 hours to car show and AGM battery smells and it very hot. Voltage at gauge shows around 15volts?

Thinking voltage regulator? Still safe to drive home after show?

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post #2 of 11 (permalink) Old Aug 24th, 19, 9:51 AM
 
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Re: 72 Chevelle battery very hot

Check with a volt meter. 14 v should be max. Any higher the regulator is toast and will continue to burn up the battery . Pop the caps off the battery check level of fluid.
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post #3 of 11 (permalink) Old Aug 24th, 19, 9:58 AM
 
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Re: 72 Chevelle battery very hot

If you donít have a big electrical load you could start the car . Disconnect the regulator and run on the battery only This would stop the battery over charge damage. Good luck
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post #4 of 11 (permalink) Old Aug 24th, 19, 10:20 AM Thread Starter
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At idle it’s around 12.5. At 1500 rpm, it’s around 14.5

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post #5 of 11 (permalink) Old Aug 24th, 19, 12:55 PM
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Re: 72 Chevelle battery very hot

Check your voltage after the car has been going down the road a bit. Anything over 14.1 volts is an overcharge condition that will shorten the life of an AGM. For long life 13.6 volts while in use is a good number for an AGM.

Turn on your headlights and blower for 2 minutes to remove any surface charge, allow to sit for a minute and check your battery voltage. 12.8 volts is a fully charged AGM battery. If it reads near 10.5 volts you have a bad cell and battery should be replaced.

Running at 14.5 volts continuous will overheat the battery cells. The AGM is like a closed environment. It saturates the mats by converting hydrogen and oxygen to water. High voltages hamper the ability of the battery to maintain it's environment so to say. It doesn't produce the moisture it needs and begins to cook off and fail at high charging levels.

Can you make it home, maybe? But further use as is may destroy the battery if it's not already destroyed. Do not attempt to disconnect the battery and drive home on the alt. That will likely damage the alt. A better course might be to pick up a flooded lead-acid battery at a local Walmart-cheap cheap which is less susceptible to overcharge and get home to analyze your overcharge issue. You could also pick up a new regulator and replace your old one, but it could put out the same 14.5 volts that your old reg is putting out which is not out of line for a lead acid battery.

When you get home you can research this topic yourself. It's a YMMV topic and I'm sure everyone has an opinion.
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post #6 of 11 (permalink) Old Aug 24th, 19, 1:27 PM Thread Starter
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Purchased a new regular at show and swapped it out. Only provided 12volts when running? So took apart the old one and cleaned the contact that was burnt closed. Put it back in and it’s operating ok to get home. Thanks for the help guys.
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post #7 of 11 (permalink) Old Aug 24th, 19, 6:48 PM Thread Starter
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Regulator crapped out again before I left the show, voltage went to 16v. So disconnected the alternator and drove home. So need to look for another regulator. What’s the best choice today?

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post #8 of 11 (permalink) Old Aug 24th, 19, 8:05 PM Thread Starter
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Btw. When it cropped out at the show it was reading 16v

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post #9 of 11 (permalink) Old Aug 24th, 19, 9:40 PM
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Re: 72 Chevelle battery very hot

We use to recommend the Wells 715 regulator, but the last 5 guys that had issues came here with brand new Wells regulators. Their first go rounds were dudes out of the box. I think Autozone is the sole distributor for Wells besides Ebay. If you're going to buy one, get it locally so you can return any duds.

Of those five guys, 4 went back and got replacement Wells and one went with the Duralast mechanical regulator that he is happy with at last report.

Good news is your alternator is fine since the old regulator performed a full field test for you.
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post #10 of 11 (permalink) Old Aug 24th, 19, 10:37 PM
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Re: 72 Chevelle battery very hot

go to NAPA and get their solid state regulator and good luck!!

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post #11 of 11 (permalink) Old Aug 27th, 19, 7:35 PM Thread Starter
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Installed the autozone Wells 715 solid state regulator. Works perfectly. My battery had 12.5 volts before I started it and after it fired up it was charging at 13.5 volts. You can even swap the Delco cap on it too.

Thanks for the help everyone!!!

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