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It is fairly common on US cars for the taillights and dash to be on the same fuse. This is apparently planned so you would know when you taillights are out. (the manual does not tell you that) If you have a owners manual, find the taillight fuse and it is probably blown.
GOOD ADVISE--I ALSO LEARNED THAT THERE MAY BE FUSES IN UNDER THE HOOD ALSO. FOUND OUT TODAY THAT IF THE DOME LIGHT DON'T WORK THEN IT'S FUSE COULD BE BLOWN AND HINDER THE CIRCUIT TOO. I'M NOT GOOD ON VOLTAGE READING , BUT DO HAVE A TEST LIGHT. IF NO FIRE AT THE COMMON TAIL LIGT-DASH LIGHT FUSE , THEN THAT MIGHT NARROW IT DOWN. I HAD THE SAME TROUBLE IN MY 1990 FORD XLT LARIAT AND WAS BLOWING THE TAILLIGHT FUSE. IT WAS A SHORT IN THE EXTERNAL TRAILER KIT HARNESS WHICH CAUSED FUSES TO BLOW REGUARLY. WHERE IS RELAY FOR TAILIGHTS AND OTHER FUSES UNDER THE HOOD??
Either the bulbs need replacing (minor electrical surge) or you have wires grounding out prematurely. Check the all the fuses one more time, there could be something directly related.
You need to check for a blown fuse or a bad relay. If you find a relay identified for taillights, swap it with another relay and see if the lights will com on. If they do then replace the bad relay with a new one.
My 97 Rodeo had the same problem. No Tail lights, no. Dash lights. There is also an annoying buzzer that goes with the set telling you the lights are on, there is no key in the ignition and your door is open. (you don't notice it when it's gone but you sure notice it when it's back) The Fuse (taillight Illum) was good, The Light relay under the hood was good and all bulbs were good. What fixed this problem was replacing the tail light relay which is located in a panel just to the left of the brake pedal also called the kick panel.Inside there are 3 relays. I replaced the one in the middle and got everything to work. If you need to identify the relay you can put your hand over it and then turn the lights on and off. The correct relay should click. Mine was the middle one. Hope this helps someone because it stumped me for months.
There seems to be a unwritten rule that the tail lights are on the same wire as the dash board lights ... if you have no dash board lights, neither do you have tail lights. There is a blown fuse somewhere, your job is to find the wire causing the trouble and it is likely at a most inconvenient place near a hinge.
try the pressure switch on the brake pedal itself sometimes they get stuck in if so wd40 it or at times the wires come off or the switch itself needs replacing you can test if the switch is faulty by touching the two wires together the lights will come on if they dont its not the switch
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