Toyota should be a fuse bloc under the left side of the dash oem ran the truck lights should still run camper running lights . worst case by pass and run new wire but make shure you have a fuse on it. can you see any wires in side in cabnets etc do rest of running lights work . if you have side lights that work and front dont maybe run new wire off them. i had a short inside my 78 lost three lights one side fuses all ok found nothing ever cut off dead head it run all new wire too it . A big thing can be the grounding use a meter i use a five dollor test light the most clip on one end sharp point kind ext. usfull tool, let us know