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427 with Hot batteries

June 25 2012 at 10:45 PM
Bill Miller  (Login highestr8)

1968 Christ Craft Grand Prix 427

End of last season I started having some issues with the batteries in my 20' Christ Craft Grand Prix getting HOT.

Two batteries were installed with an A-B- Off switch allowing me to select either battery or disconnect both batteries.

There was so much heat at the switch it actually started to melt.

I mistakenly assumed it was a bad switch so I removed the switch and ran with just one battery.

Then I realized the one battery was getting very hot as well.

I ran out of time last fall and now looking to figure out what's causing the heat problem.

Some searching on line seems to point to a faulty voltage regulator.

Would appreciate any advise from you experts!!

Thanks. Bill

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Sounds like the voltage regulator as you noted

June 26 2012, 9:33 AM 

Voltage regulator seems to be the culprit, and any time a battery is getting hot you have a VERY serious problem because they can pop a cap and release hydrogen gas and it is very explosive. On your system I am wondering if your voltage regulator system is charging both batteries at the same time or whether you have a "battery combiner" that isolates one from another. Otherwise if one battery is down the system will think it needs to charge more, etc.

I hope you can figure it out because a hot battery is a seriuos issue. A 20' Grand Prix is an awesome boat. I agree about having a double battery bank too, basically on any boat. Good luck, send us some photos !



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