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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...

What type of alternator does that connect to? Normally a Delco 10si internally regulated alternator would be on a '73.

Found a couple more images to show what was modified and how the unit fit.

Gentlemen, Working on my 1973 1200 flareside pickup with a 304. I believe the voltage regulator is the culprit in my electrical issues...