Tail light wiring ?? - Ford Truck Enthusiasts Forums Apr 27, 20111973 - 1979 F-100 & Larger F-Series Trucks - Tail light wiring ?? - I have lost, misplaced, or just can't find my Haynes/Chilton. So i was hoping I could get some help from the guys with the experience. I would like to do this right and only one last time, I hope. Does anyone have a color coded copy of the tail light..Tail Light Wiring 1991 F350 - Ford Truck Enthusiasts ForumsNov 05, 2017taillight wiring diagram?Apr 01, 2016wiring on led lights on flatbedMar 30, 2012Tail-light wiring harness - Ford Truck Enthusiasts ForumsJan 23, 2011See more results tail light wiring. - Ford Truck Fanatics Nov 09, 2009tail light wiring. Generation 6. If this is the flat bed it is hard to tell where they grounded this. On a normal bed in a 70 series truck there is a small wire that is attached to the bed by each tail light.