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A service manual will provide a series of tests that may help troubleshooting steps. But, since this sounds intermittent then it may be a connection problem. Try a visual inspection looking for loose connections.
its for the lights mostly..left right tail, brake, backup, license plate..you have brown, yellow, and white, and two shades of green mostly..brown is running(tail/license plate) wire..yellow is left brake, /turn light gren is right side and last wire is reverse..(some may be wrong but its close)..
oh and fuel tank.. sender../pump..not sure of the colors there..I think purple or black..
Your description, I take it, is a problem with the wiring harness going from the driver's compartment to the rear lights. If that is the case, the normal color code for GM is brown for tail lights, dark green for the right stop & turn, yellow for the left stop & turn and light green for the backup lights. Any black wires should be grounded. The white wire in the trailer harness is for a ground when used on a trailer. It sounds like you have the green and yellow T&S wires shorted together somewhere! Some of the later vehicles use separate stop and turn bulbs... these would have a separate wire for the stop lights only, but I don't think your truck is new enough for that. Good luck!
START engine and turn on head lights to main beam if engine stops and battery is flat then the Alternator isent putting out 13.5 volts or 12volts so then turn off lights and turn on inn and with a test light check power lead on Alternator if you have power to alt then you have either Reg or brush problem .
Take it off and get it tested and if slightly faulty then get a change over one and refit start and recheck your head lights as they should come bright when engine runs evan at idle .
ITS that easy
ARE YOU READY
L.H. STOP AND TURN ( YELLOW )
R.H. STOP AND TURN ( GREEN )
TAIL, LICENSE, SIDE MARKERS ( BROWN )
GROUND ( WHITE )
NOW THE COLORS ON THE VEHICAL ARE GOING TO BE DIFFERENT AND YOU WILL NEED A 12 VOLT TEST LIGHT FOR MAKEING SURE YOU HAVE THE WRITE WIRES FROM THE CAR TO THE TOE BAR, DON'T NEED BACK UP TIGHTS FOR THIS
a very quick test to determine if the window motor or the window control switch is defective is this,( this works best in a shaded area) turn on the dome light, press the window up/down switch, if the dome light slightly dims then the window motor is bad, if not the switch is defective and or has no power to it.
your question before about fuel starvation may be correct. diesels have a habit of clogging fuel filters and spark plugs, they get overgapped. Try these items, if changed already, try looking up the engine light code, autozone does this for free, this will definetly lead you to the problem.