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There is a headlight relay in the engine compartment fuse box, but its after the headlight switch and before the dimmer switch, so it powers both high and low beam circuits. I would check the dimmer switch.
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.
yes, ideas,your headlight switch on the steering column may be going bad. try tilting your steering column up and down while pulling headlight switch on, do your headlights turn on and off by them selfs? careful!! this is a hot or positive wire grounding to metal,which could lead to a fire in the steering column!! do you ever see,or smell smoke coming from the steering wheel? if you do,disconnect the positive cable from your battery immeadiatlly!! the only way to replace the switch is the removal of your steering wheel,if you are'nt mechanically inclined,i recommend you get a 2nd opinion and go forward with your problem as it can lead to a fire in your steering wheel or fuse panel! if all your fuses are good,and only have fog lights,but no low or high beams,but pull back on the turn signal switch,you have a problem with the headlight switch.located on the 'turn signal,high beam,low beam switch' on the steering column. the only way to repair,is replace it. sorry!! can recommend autozone auto parts,advance auto parts or try used parts place.but if you are keeping the car,recommend"new" part replacement. thank you for choosing fixya.com!!if we can be of further assistance,please repost your questions to fixya.com!
try the lights with the tilt wheel in the up position. If the low beam works then, a wire has pulled out of the connector on the mutipurpose switch inside the steering column. remove the covers behind the steering wheel on the column and there is a large multi wire plug with many wires. it should be obvious which wire has pulled out or broken.
Fuse 22 and fuse 23 are left and right low beam headlamp fuses located in the PDC. 23 and 24 are high beam fuses. There is also a low beam and a high beam relay in PDC as well. If no headlights work I would check for main switch or multifuction switch (wiper/high beam) since each light has its own fuse and relay.
I would start by checking the headlight relay and headlight fuse. You also may wanna check to make sure the bulbs aren't blown out. If those parts check out to be fine and in working order, you may need to replace the turn signal assembly in the steering column. This part controls the hi/low beams. This may sound crazy but, when GM wired their older trucks, they wired the headlights to go from the battery, to the hi/low beam switch, then to the headlight switch (to the left of the steering wheel) then out to the light bulbs. You can kind of test to see if this part is good by making a fist and (with your headlights on) gently hitting the plastic cover for your steering column that is right behind your actual steering wheel. This could cause your headlights to flicker on and off. It's not 100% guarenteed that this method will work, but it may.
Any questions, just ask!
pull on the signal lever toward you (ceter position). the signal lever controls the head lights either high beam or low beam. if you pull on the signal lever toward you again, you will have high beam temporarily. and if you push the signal lever towards the front, you will have the high beam locked.
might not be. high beam is directly connected and controlled by the switch in the steering column. that would be a great place to start trouble shooting. i have found a lot of problems from contacts over heating and melting the plstic holders on those switches.
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