:Dalways check the ground connections 
if it's a chevy, just put it in the ground 
i know what you mean about truck light wiring. i actually pay somebody else to do those jobs 
Day 4 after resplicing old connections in wiring. Still couldnt get it right.
So started tracing wiring from fuse box to taillights. Low and behold a dang 6" ground wire I had never noticed before on the frame going into the driver side taillight.
Went to remove the 5/8 bolt holding wire to frame and she pushed right through my old rusty 89 K truck frame.
I had a ground already set up from a ground I made up years back for license plate lights one time. So I just spliced it over and
Woooohooooo

Only thing after tracing the wiring all the way back and looking at my fuel lines etc too while doing so. This ole plow truck is a time bomb for repairs in the future. Had to love 1 of the trans line blowing last year while driving on the worst night of the year.
Went ahead and replaced the other line this summer when I noticed a leak starting.
Thanks guys
