The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Anyone use the headlight relay wire harness from LMC

AnlaufJohn · 07-05-2013, 07:56 PM

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.

07-05-2013, 07:56 PM	#7
AnlaufJohn Registered User Join Date: Feb 2009 Location: Lebanon, Oregon Posts: 130	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. __________________ 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