Ok first off I have an 87 GMC 1/2 ton, I put in the euro headlights (4) and they all work great.
Now my marker lights were working, then they became dim, now they dont.
I checked the brown wire running from the side marker and it had like 1 volt to it, I traced it to the headlight switch, still only 1 volt, I took the switch out and checked it on the battery with a hot wire, and the switch itself is good.
I did some testing on the incoming wires for the switch and I have a constant 12 V on the large red, but on this orange wire I am getting about 1 volt??? I dont know much about wiring so i am pretty lost.
Any help is appreciated. Bob