about into 20 minutes drive with high beams on the lights start clicking on and off like they are hooked up to the flasher switch. all the lights off then on, then off, then on. been wet both times. stop truck turn off lights, they work fine again but i leave the high beam off. any idea where to look. 89 dak 4x4. not good, i drive 2 hours in the dark on the way to work every monday

 

I'd put money on the headlight switch.

 

Ya the head light switch has a circuit breaker build in. Ether the switch is bad or the water caused the wiring to short which is causing the breaker to open and close. From factory they should have added in relays to keep the power demand on the switch down, which that circuit breaker could get overloaded easily.

 

i changed that out a few years ago, maybe 5 or 6, the old one literally dripped molten metal down onto my foot. the new one looked to be designed differently, maybe it is that switch again. its odd though, it switches back and forth like its on a flasher, perfect timing. easier to try that than digging into the column looking for the high beam switch.