I changed the gray panel for the taillight assembly,checked the fuses all are good my blinkers,taillight and reverse lights work.3rd brake light is only brake light i have at the moment could this be a broken ground if so is the ground wire on the frame or inside ?
Check the brake light switch located on the top of the brake paddle also check the butten on it if its stuck in.
SOURCE: No brakelights or taillights
Yop may have a very common problem unique to that year car.
I have two definite fixes for you:
Open the trunk. Look at the wiring harness that is hooked onto the driver side arm that holds the trunk lid to the body. Untape the wiring harness from the edge of the trunk lid back towards the driver rear seat. You are most likely going to find a broken wire or two, prob a green with a red tracer. The repeated action of lifting/closing the trunklid seems to break the brake/tail power wires. If the wiring harness is perfect, no breaks, AND you have a rear spoiler, remove the trunk interior trim that faces the driver side 1/4 panel. Hidden behind a brace will be a small box. This is the brake lamp sensor. If it has failed, you may need to replace this box. Either fix should resolve your issue.
SOURCE: My chevy z71 96 running lights work, but not right brake/blinker
check for a short it could be anywhere in the line
SOURCE: 2006 chevy trailblazer heater blower motor not working
You might wanna check and make sure the heater switch didn't go bad. It could even be the blower motor itself.
SOURCE: 1986 Toyota Pickup Instrument lights and tail lights out
Even though the relay is activated,I assumed you checked the out put?Also,You checked the voltage at the light sockets?With a meter,or test light ,check the fuse for the cluster lps,adjust them to dim,and to bright,the meter should act accordingly on the fuse.If it does not,replace the dimmer control,or head light switch,witch ever controls them.This may allow continuity to the tail lights as well.If the fuse is dead for the cluster lights,replacing the dimmer control,or head light switch will solve the problem,or,from another fuse ,supply voltage to the cluster lp fuse,one that is only hot with the key on,cause if you do this the dash lights will come on,every time you run the vehicle,day,or night.
SOURCE: Igot a 1987 chevy blazer
There is a short to ground in your tail/park light circuit. If your blazer is equipped with a trailer hitch, the first place I would look for the problem is in the trailer wiring. Otherwise, the circuits need to be traced from the fuse to the tail lights and/or all of the park lamps to find out where the short circuit is located. Whatever you do, DO NOT put a larger fuse in the fuse block. This will result in your vehicle burning to the ground. (I have seen this several times and it isn't pretty)
If you have a full-size Blazer, it should be a 20 Amp fuse. This fuse also powers your cigarette lighter, so check there also for a problem.
If you have an S-10 Blazer, it should be a 20 Amp fuse. This fuse also powers the courtesy/dome lamps.
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