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There is a tail lights fuse for the truck, but not for the trailer.
First, check that your left tail light on the truck is working, if not fix the problem (new bulb, bad contact, fuse).
Then the obvious suggestions regarding the trailer are: Check the tail light portion of the bulb to be sure it is not blown. If good (best to put in new one to be sure), then check the wiring from the front of the trailer all of the way to the non working bulb, including every connection and at any place it is secured to the trailer frame. If all is good with the trailer circuit and bulb, then check the truck's trailer connector, including any adapters. If by chance the truck is wired with a flat 4 wire harness the problem may be solved (but usually the blinkers are the problem). Modern trucks require a 5 wire harness which self adapts to the standard 4 wire trailer circuit. Check for dc power (12 volts) from the truck's female connector. One wire will be ground, others will be taillights (turn on headlights), brake lights (have someone press brake pedal), and blinkers (turn on switch and blinkers).
forum.ih8mud.com > Forums > Toyota Tech Forums > 80-Series Tech
Dec 6, 2014 - Now my taillights don't work but Brake lights, Turn signals are good. .... If all the fuses check good with a meter, then head upstream to the ...
Jan 16, 2014 - 10 posts - 4 authors
My bulbs are fine, because the blinkers work, the brake lights work, and so do the reverse, but no tail lights ... I know that the "License Plate" lights are on the same fuse as the tail lights. ... However, I don't have a schematic, so I don't know if that's the case. ... Anywhere I roam where I lay my head is home.
Tail lights don't work right. ... I would suggest if you can replace the heads of there bad then do all at once because of you ... Replaced bulbs but still don't work. ... What would make my rear brake lights not to work and also my traction part also.
? 1:25
https://www.youtube.com/watch?v=SK36wPXo2EQ
Feb 11, 2014 - Uploaded by 4Runner Nation
I got the same problem with my 91 f150 but just the dash lights don't ... for my head lights n dashlights ...
Hi Mary ANN , need some clarification ,the fuse's for all these thing's you have listed , the tail lights, hazard, headlights, blinkers, cruise, brake lights, coolant fans are good ? If good what makes you think you have a short ? Explain ! Are these thing's not working ? That wouldn't mean you have a short . You could have a bad ignition switch !
You have a bad ground wire somewhere. Try running a new ground directly from the battery to the body of the car, possibly attach it to a strut bolt or something handy to the battery.
Wires run along the drivers side perhaps under the carpet and door kickers or plastic plate in door jam to the back of the car. Open trunk remove left side carpet just behind the tail lights and check this wiring.
Locate the negative wire going to your head lights (only need 1 and run a new wire from it directly to the battery or the ground you made from the battery to the body.
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