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Well iam happy to report that the dimmer switch was the problem. Picked one up got it installed and everything is working as it should. I did have small issue with headlight fuse acting up. While i was under there and tried lights for first time i had no lights but noticed the fuse seemed to be...

Well went home at lunch and it appears it is the dimmer switch that is bad. Did the diagnostics ie. removed plug and jumped the connections and both lights work high and low beam...now i just have to get part and should be good to go. Big thanks to Warthog...and also cucvrus for helpful pms.

Thanks Warthog all good info. Gonna try and do that at lunch.

Thanks for your patience...just read thru that whole stickie again. Think i will try the service switch bypass I read about on here just to eliminate that from the equation for now. I did notice the headlight fuse is very loose. Whats puzzling is that when I read through other posts there seems...

Okay so I had some time last night to work on getting the lights working. Everything except the headlights works now, appears blackout switchs work, maybe not sure. There is no power to headlights started pulling dash apart got BO switch plate out but ran out of time to mess with it. The truck...

Yes I think I did quite well with this truck. It was a maintenance vehicle for a retirement home for a number of yrs and appears it was really well taken care off. Knock on wood every issue so far has been very easy to resolve. Not as easy as the last 87 1 ton I bought that guy swore it needed...

Yes I do and will...I know im jumping the gun a little just trying to get heads up on how that upgrade works. Just quickly poking around with test light it doesnt appear there is power at plugs. I need to do complete troubleshoot procedure. And i do know a test light is not a multimeter... lol...

So does the headlight harness upgrade continue back to headlight switch and that is what controls on/off? read the stickies just didnt see where it says how it gets switched power.

Dr Porkchop think I talked to you about bumpers and clevis's maybe. Went home at lunch and cutout horn diode,cured horn issue and rest of driving lights work have reverse lights too, very bright now actually. Still no power to headlights though...

Picked up an 85 cucv I have owned a bunch of these 80s GM trucks and have always wanted one of these but could never get to them quick enough when they came up for sale. Truck had not been started for three yrs and had pass.side alternator issue which turned out to be missing insulators inside...