The Ford Barn - View Single Post - Nu-Rex 12V alternator Overcharging

rotorwrench · 08-12-2023, 08:24 PM

Is this alternator a GM 10si unit or something else? I know Nu-Rex uses them but they change the pulley and set them up for 1-wire operation. They sometimes need help on their first self excite but it sounds like it had a bum internal regulator. You may also have a loose wire in your system. Make sure your two terminal box studs are well connected. Check your ammeter for damage and test it by turning on the lights with a normal discharge indication. A person can use about any aftermarket voltage controller for these as long as they are 12-volt negative ground. Just make sure it is properly connected.

Also check your battery out. If it has problems then the alternator is going to try too hard to compensate for that.

08-12-2023, 08:24 PM	#2
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 17,410	Re: Nu-Rex 12V alternator Overcharging Is this alternator a GM 10si unit or something else? I know Nu-Rex uses them but they change the pulley and set them up for 1-wire operation. They sometimes need help on their first self excite but it sounds like it had a bum internal regulator. You may also have a loose wire in your system. Make sure your two terminal box studs are well connected. Check your ammeter for damage and test it by turning on the lights with a normal discharge indication. A person can use about any aftermarket voltage controller for these as long as they are 12-volt negative ground. Just make sure it is properly connected. Also check your battery out. If it has problems then the alternator is going to try too hard to compensate for that. Last edited by rotorwrench; 08-12-2023 at 08:46 PM.