Re: Anyone use the headlight relay wire harness from LMC
Three prong plugs are for High, Low & ground. 2 head lamp trucks like Chevrolet use 2 headlamps total.
GMC uses 4 head lamps, means 2 prongs, High/ground, Low/ground per side.
The wiring, if I were building it myself, would have 3 wires to each side, regardless of make. High, low and ground. The grounds would be paired together, attached to the frame.
I have done this upgrade for 2 of my motorcycles and my Chevy. A new wiring harness is not needed, just the relays and some wire.
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Eugene, Oregon
Lucy's Limousine
1966 C-10 LWB
283 w/ 2bbl, OE carb and dist.
4 spd (granny 1st) w/ 3.73 rear end
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