And there were pictures...

In the process of repairing an intermittent short in the headlight system I found these. None of which were the problem.

The corroded off wire in the first picture was in the wiring loom directly behind the RH steer tire. No tape, shrink tube, etc... had been used. Someone then skived the insulation off of wire 22D coming out of the RH headlight relay and ran a light gauge jumper wire to front of the truck. A crossover wire was used to hook the headlights together but was left hanging across the front cross member. It is pictured below. I repaired the damage to the harness in the loom and completely re-did everything from the end of the frame rail forward. New pins in the metripac connectors at the headlights and the harness is now back to OEM original using numbered wire.