I was wiring a trailer wiring harness in. Now the tail lights are not working. The blinkers and brake lights work. I found the fuses under the hood but none indicated the rear lights. I could not find a rear fuse but no owners manual came with the car when I bought it three years ago. Any suggestions?
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Re: tail lights out
There is another fuse box behind the change holder on the lower left side of the dash. When you open the change holder you will see two "Fingers" one on each side that hold the change box up. Gently squeeze these inward and rotate the change box out. You will find the missing fuses there!
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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).
I would recommend taking out the tail light. Get a test light, have an assantant step on brake. U will see the bulb in tailamp light up. Probe the wire w/your test lamp. That is brake wire. Repeat that process for blinker.. Drop down those two wires. Hook that to the same side on trailor. Repeat for left and you should be all set.
sounds like a problem in your wiring harness- very time consuming- start by checking for 12 volts at the lamp sockets individually and work your way back the harness. I have seen problems with the harness near the tail light assemblies or a bad trailer harness installation...good luck
i believe the trailer brakes run off the same fuse as the tail lights no extra fuse all the ones ive seen the trailer lights just fuse into the wiring harness of the rear tail lights so if your brake and turn signals works your prob is gonna be in the trailer lights them self or your connection in the wiring right behind the rear bumper. Hope this helps
brown to the tail lights. yellow to left turn signal. green to right turn signal. this is a basic 3 wire hook-up i use all the time w/4wire connectors for all trailers. white wire is not used. ground is established when you hook to the ball.
to find the correct wire to splice to, use a testor (has a clip to the bare wire, and a sharp point to the truck frame). using a needle, push it through a wire to rear light harness. turn on the turn signal. check if the connection is the blinker, testing until you have the blinker wire. the tail lights can be attached to the license plate wire. brakes and blinkers use same wire, so brake lights will work whenever the turn signal is attached.
to be sure everything is working right, have a second person go inside the truck and work the signals, brakes and lights one at a time while you are at the back of the trailer telling what to do.