I have recently lost my headlights on my '02 GMC 1500. The Truck was built in Canada and has the constant run day lights. I have power to the fuse box under the hood and the power leaves the fuses ut doesn't get to the lites. The relay/regulator is o.k. and the hi-beams work fine. I first lost the passenger side headlite about 6 months ago and the drivers side last nite. The Bulbs are fine and the connectors are clean. I'm guessing because this truck has been in an extreme weather climate, that maybe the grounds may have corroded or maybe a harness connector has worked itself loose. I don't drive that much at nite so, If I had to I guess I could swap the hi beam lite bulbs over to the other side of the shell and flip the switch on High. any ideas? Thanks

 

Those high beam bulbs wont work in the low beam spot. Different fitting. But looks like it needs tracing down from the connection to see where its broke.

 

Got any ideas where the wires route thru the truck to the headlights? Thanks

 

Well my friend your gonna need to get a multimeter and do some testing. Its a little task, but eventually you will find it.