A while back I posted about some electrical problems I have had with a '97 F-800. One problem remains, and it seems to be eluding the dealer - who has been cooperative with me up to this point, but I am tired of second guessing their technician and wasting down time with the vehicle. No matter what we do - the headlights won't stay on. The switch is new and so is the entire headlight wiring harness. After about 10 minutes the headlights flash. Not the parking lights or other accessories, just the headlights. This leads me to believe the circuit for the headlights is a straight shot, not related to the fuse for the tailights or parking lights. A mechanic friend of mine suggested that there is a resettable circuit breaker inside of the headlight switch, that seems to keep tripping. Has anyone experienced this? When the dealer replaced the headlight harness I told them to leave the plow lights out of it, since they attributed the problem to the plow lights originally. We had to direct wire the plow lights through a totally separate circuit, and this has worked fine, and has its own fuse.