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Old 11-06-2017, 04:41 PM   #1
Matthew Welcher PWA
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Join Date: Jun 2009
Location: Fairfield Iowa
Posts: 429
The number 4 wire from the regulator to the starter what is it's purpose

On the standard M37 2 wire regulator harness, the #4 wire that goes from the out put side of the regulator to the starter switch. Then the #10 wire from that harness goes to the circuit breakers. Which then powers everything internally under the dash so to speak.

How what and where does the voltage inside of that regulator function?

And or the path of voltage, how does it travel and what directions?

I have wired dozens of these trucks, I do not have a complete under standing Is it that the voltage from the regulator charges the batteries through the #4 wire to the starter?

Thanks for thinking about this with me.
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