Electrical Gremlins...Please help

working on a 99 250 with a service body. have head lights, front parking lights and rear brake lights but NO REAR PARKING LIGHTS OR SIDE MARKERS. all the lights themselves are fine. is this a headlight switch issue or something else? Im not the best with 12v electrical systems but i traced the wires and to me the wires look fine. im just not getting any power on any of the running lights on the service body. any help would be greatly appreciated!!!

Anyone? Still havn't been able to figure it out...

sent while doing burnouts somewhere in the country

Aren't they on a separate fuse? Just a thought.

Check your trailer tow fuses. I had a truck just like that a while back and the trailer tow fuses were blown. The installer of the flatbed wired into the trailer tow harness not the truck harness. Had me scratching my head for a while.