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Next, trace out the purple wire that is spliced to the white wire at your alternator and see where it goes. That wire is suspect. What...

First off, the red wire coming from the alternator and looping back up to the battery interrupted by that inline fuse on the...

It's not a voltage regulator at all. It's some type of emissions control device. Any reading below 13 volts while the engine is...

Rev it up a bit and see if it starts charging. If yes then the side plug is wired wrong, no and the alternator is suspect. That...

I just checked, it starts and runs fine without the regulator but it’s still not charging above 11.68 volts

And thanks, I’m the third owner, I was told the previous owner replaced the transmission with a older international dump truck...

All the dash board lights and gauges work

Got it, so what is the purpose of the voltage regulator and the harness going to it? The alternator has a two wire plug in the bottom...

That's a 10si alternator, so that regulator is not needed. However some of the wiring to it is missing. There's a plug with 2 wires that...

1210,1973,

I’ll post the pics tomorrow, thanks again

Hmm. Ok, well it doesn't belong to that truck, or shouldn't belong to it. Perhaps someone has done some type of crazy retrofit for...

Thanks, and yes it is a 1973 1210, I will send a copy of the data plate but the pictured voltage regulator came out of the truck.

Your truck is probably a 1970, not a 1973. A picture of the truck and the vin data plate would help confirm. Reason I say that is, for...