Update:
Finally got around and replaced every light socket on the truck today. What a mess. The corrosion, dirt and half assed barley twisted together wires makes me understand why the truck is having problems.(would like to kick the previous owner in the junk hard enough that the owner before him would feel it also) The wiring for trailer lights was all screwed up, basically pulled all wiring out and laid it out on the work bench and started redoing it. no more crimp connectors, 100% soldier and heat shrink All lights and signals now work.
Finally got around and replaced every light socket on the truck today. What a mess. The corrosion, dirt and half assed barley twisted together wires makes me understand why the truck is having problems.(would like to kick the previous owner in the junk hard enough that the owner before him would feel it also) The wiring for trailer lights was all screwed up, basically pulled all wiring out and laid it out on the work bench and started redoing it. no more crimp connectors, 100% soldier and heat shrink All lights and signals now work.