[VetteVet]

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Originally Posted by chad64chevy

so trying to solve this problem didn't help today! I replaced the dome light harness and housing cause it wasn't working either an it was old an broke, also no power to the orange wire at all! so the plan is, I ordered a new oem main harness from classic parts today! another reason for me ordering a new harness is I noticed it blew the stop light fuse an as I was changing it out, battery still connected it was arching really bad!making me think that the main harness was grounding itself out or not grounding and no thing I could think of was helping so I disconnected the battery a will wait til the new harness shows up!

Most likely you shorted the orange and white wire going to the dome light while you were changing out the harness with the battery still connected. The orange wire is hot all the time as long as the battery is connected and the white wire is the ground side and you probably had the door open while you were working on the harness. This connects the white wire to ground and the orange wire is hot so Poof there goes the fuse.

also I have a hd headlight relay harness from lmc that I would like to install but it has a three wire prong coming out of it an not a two prong connection like the original harness does, it has a solid blue an solid yellow wire going to both lights an each have a ground wire, there's two relays! both yellow wires go to one an both blue wires go to another for the low an high beams, both relays have red wires going to battery, then a brown wire comes off one and a white wire comes off the other a blue wire with a white stripe goes to both of them! the brown, white and blue w/ white stripe go to the three prong! how would I wire this to work for me??

Doesn't your headlights have a three wire plug? The GMC trucks have 2 bright bulbs with two wire plugs and the other 2 have 3 wire plugs I think, but chevys all have just 2 bulbs with 3 wire plugs as far as I know.

You will have two wires in the truck harness that will power the relays in the HD harness. A green one for brights and a tan one for dims. These two wires will come from the dimmer switch and go to the no. 86 on each relay. Then we will have to figure out which wires will ground the relay to no.85 on the relays. Lets wait until you get the new harness installed to get into this phase.

looking up how to wire in a headlight relay harness, my thinking is the blue wire with white stripe is a ground, the brown wire can go to the brown wire under the hood and the white wire can go to green under the hood! am I right or am I wrong, thanks for your help !!

Let's wait until the new harness is in.