Battery overcharging - The 1947 - Present Chevrolet & GMC Truck Message Board Network

gd252 · 01-31-2004, 11:00 PM

Hey All-

I've got a 72 3/4 ton longhorn with a 402 in it. The battery is overcharging. It's at 13.25 volts with the engine off and goes up to about 15 volts with the engine running. The alternator and voltage regulator are stock. I've had the truck for 6 months and haven't messed with the charging system. I installed an electric fan that pulls about 25 amps. Today I let the truck idle for about 10 minutes and it wouldn't start for about 1/2 hour then started. I have the stock exhaust manifolds on the truck. The windshield wiper motor was working before it wouldn't start, then it quit on me. Any ideas on whats going on? Is it worth going to a one wire alternator or an internally regulated alt?

01-31-2004, 11:00 PM	#1
gd252 Registered User Join Date: Jan 2004 Location: Edmonds WA Posts: 5	Battery overcharging Hey All- I've got a 72 3/4 ton longhorn with a 402 in it. The battery is overcharging. It's at 13.25 volts with the engine off and goes up to about 15 volts with the engine running. The alternator and voltage regulator are stock. I've had the truck for 6 months and haven't messed with the charging system. I installed an electric fan that pulls about 25 amps. Today I let the truck idle for about 10 minutes and it wouldn't start for about 1/2 hour then started. I have the stock exhaust manifolds on the truck. The windshield wiper motor was working before it wouldn't start, then it quit on me. Any ideas on whats going on? Is it worth going to a one wire alternator or an internally regulated alt?



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