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you may have a bad switch for the lights.if the fuses and the bulbs are good,you don`t say if your talking about the headlights tail lights,dash lights,signal lights brake lights,low beam lights high beam lights or both.i`m assuming headlights.if you have a daytime headlights,the relay in this car it could have gone bad as it is tied into the regular headlight system.
Hello, try to start by checking the headlight relay and headlight fuse. You
also may want to 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.
Ignition switch will cause you to loose your head lights and turn signals. You will still be able to start the car and hold the switch for your brights but normal function is gone. Check it out it usually only runs about $20-$30 for replacement part but you need a special puller to get to it.