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The ground goes to the frame stud just below the alternator on the front crossmember you can really use the ground on the harness and it's fine as long as the ground is good the hot wire I recommend a dedicated wire for charging purposes due to the voltage loss thru the harness to the pcb...

Alternators have voltage spikes that can occur this will blow the diodes in the PCB. Starter lugs are available in 1/2" eyelit to go to 4 gauge. All my equalizer wires are 4ga

Post a picture of what you have. Headlight harness goes in on the drivers side just behind the radiator it cuts thru the frame Generally there is a ground on the frame crosemember below the alternator. It's a stud type. On the A2 the harness wraps the cross member going across supplies...

Tape the wires off in the main harness all of them going to the alternator. Use 4ga wire and eyelits. Run 4ga wire from alternator to starter post for ground and power. This allows a more direct power from the alternator to the batteries. The original wiring goes back to the PCB on the...

What type of truck? M39,809 OR 939