Re: C20/cummins 12 valve
Alternator you can run a Mopar external voltage regulator as a stand alone Setup like the old school applications did, or like mine I used an internal regulator conversion and all I need is one keyed hot wire to the alternator and it puts out 14.4ish at the alternator at idle. Starter solenoid run your original purple wire to it, fuel shut off solenoid on the injection pump just needs a hot in start/run. I have my original ignition source feeding mine as it draws little current. Besides gauges I literally have 3 wires going to my engine.
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