72 tail light issues

[comark]

My question is are the blinker brake light and park light all run on the same hot wire?? If so where is the junction located on the truck. If not where are the wires located under the bed?? Any help would be appreciated.

[SmoothJ69]

I would assume the 72 is the same as a 69 in which case there are 4 power leads that go to the back along the drivers side of the truck (just look up under the left side of the truck or a long the left side frame rail), then split off to the passenger side behind the DS light assembly. The 4 hot leads are:

black w\red stripe = marker lights\license plate
green = right turn
yellow w\black stripe = left turn
brown = backup lights

[comark]

Thanks. As soon as I get a chance I'm going to look into it and hopefully get rid of the rat nest that came with my truck.