Dave, don't you just "love" the new wiring diagrams GM puts out? They are worthless and very hard to follow. They only show one circuit at a time and not whole schematic like old ones. Don't show connector plugs anymore either.
Did you check the Bulbs? maybe messing with stuff blew them or? The tailight housings are plastic and bolt in from bed side, and require a seperate ground wire be attached, check that for rust.
Got that truck ready to pick-up yet? Sure been crappy lately, BUT, was nice yesterday! Huh?? :p
