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Where is the fuse for a trailer lights - 1999 GMC Sierra

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It should be at the back where the hitch is where the wire plug is there may be a lose wire that is not conected when u plug it into the trailer.

Posted on Nov 15, 2010

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Need the fuse number for rear trailer lamp for 2006 Lincoln is the rear trailer parking lamp fuse located 2006 navigator


trailer lights are fused in the main fuse box of the car
tail lights on a trailer are the same fuse for tail lights of the car , the same for brake lights and indicators

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if the car lights do not work then check the tail light and brake light fuses in the car after you fix the shirt in the trailer connections

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I have a 2002 E 150 with the trailer light system already installed. The van lights all work but only the right trailer turn indicator light does not work. I have checked the problems thru the system and...


The trailer lights on your van should be fused independently of the vehicle lights if you have the factory wiring. There is a fuse junction block under the hood [should be in the left corner somewhere] and in that you should find the fuses for the trailer lights and other functions. This is from memory but check fuses #5 and #6, [10 amps fuses] and see if they are blown. I could be wrong on the numbers so you might have to check them all. Usually its the trailer that causes these fuses to blow so if you find a blown fuse replace it and make sure it doesn't blow again by testing all the lights with the trailer unhooked. If that's ok then hook up the trailer and check again. If it blows with the trailer hooked up then you probably have a short circuit in the trailer wiring somewhere. Good luck, hope this helps!

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Not sure which fuse you checked.
The Engine Compartment Fuse Panel ( Battery Junction Box / BJB ) is where the fuse is for the trailer tow adapter parking lamps.
Fuse # 5 is the fuse for the parking lamps, and the reversing lamps.

Next is the trailer tow adapter park lamp relay. This is what BJB Fuse #5 feeds, and the coil is operated by the truck's parking lamps. This is also in the BJB, Relay 201, it is the 1/2 size relay.

Not sure what you took a resistance reading from on the trailer tow adapter.

If you want, you can pull the trailer tow park lamp relay, and jumper the normally open contacts, which should provide power at the trailer tow adapters, regardless of the truck's lights.
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This is the wiring diagram for the trailer tow park lamps
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1 Answer

I tried to connect a utility trailer but the lights wont work


most trailers don't have fuses, but rely on the car fuses, and if the car lights go on, that can't be it.
You need a test light.
Check if the current is getting to the trailer connection, then check at the trailer bulbs.
But the ground connection is the most likely if none work.
The trailer itself is the ground for the lights, but you need a brown wire from the trailer frame to car frame/ground.

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its in the engine compartment in the fuse box on the drivers side next to battery

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yes there is , under the hood in a fuse block on left side of engine compartment , will be a 10 amp trailer parking lamps fuse ( TRL PARK ),,, also on right side of dash will be a right trailer turn/stop fuse and a left trailer turn/stop fuse, just for your information . i don't know if it will be plainly identified , if not maybe your owners manual can help identify it . were rootin for ya .

J5

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