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my quess is the headlight dimmer switch is bad,cant be headlight switch cause lights come on.strange things happen on car electrics still could be bulbs burned out,it does happen.buy one put it in see if light comes on,if not dimmerswitch is bad
Well the turn signals are a different circuit. Usually the common problem with one headlight is the ground circuit. Both the high and low beam use the same ground. I would check for power for each circuit and a good ground at the light socket.
These trucks are known for bad multifuction switches. the switch that i talk of is the signal switch , the handle is the switch, it bolts to side of steering column . this switch controls the signals and the headlights and high /low beams. the other thing is the headlight switch connector, the connector some times goes bad and starts to melt or just comes out of the connector. you will need to remove the cover to steering column, the screws are located under the bottom cover in holes. remove cover and check connector and then test for power if you have power going into switch but not coming out then switch is bad.
the last thing is to make sure the bulbs are good , make sure the headlight bulbs are good , and also the driving light bulbs, test for power at the connectors to those lights to. You will need to do a little testing to find the problem.
you might just have two bad low beam headlights, I have seen it before. Only other problem would be the switch that turns on the headlights is bad. Best way is to Test power going into the headlight when the low beams are turned on to rule out the switch.
Remove the carpet covering the inside near the headlight. Remove round rubber plug. (pull hard, the plug has NO WIRES coming out of it) Use the 5mm wrench that is in the toolkit. (toolkit is behind the spare tire). Turn the wrench 180 degrees and the whole headlight assembly will loosen. Pull out the whole assembly. Remove plastic end cap. The high beam, low beam and parking bulbs are all right inside that cover. Just did my 2002 for the first time. This is also covered in the manual if you have one. Thanks, firstname.lastname@example.org