running lights wire location

[muddpuppy01]

I am having a problem with my running lights. Meaning they don't work on the rear. Both left and right with the tag light. Brake lights work. I am looking to see if some one knows where the main junction is that connects the front lights to the rear lights.

Truck is a 83 k20 long bed

[bd]

The rear running light circuit is spliced to the front running lights on the inside of the cab behind the fuse block at a bulkhead connector pin.

http://forum.73-87chevytrucks.com/smforum/index.php/topic,11766.0.html

Ckt 9 - The brown (running lights) wire generally runs the left framerail to a bulkhead plug dedicated to the rear lamps, then into the cab to the headlamp switch and then to the fuse block.  It often shares a multi-wire loom with one light green (back-up), one dark green (left turn/brake) & one yellow (right turn/brake) wires. 

Have you already checked the bulbs and fuses?

[DnStClr]

muddpuppy- I've sent you a pm (private message)

[muddpuppy01]

update I ended up replacing the headlight switch to resolve my issue

[bd]

Glad you figured it out.