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Right Hand Trailer Stop/Turn Signal Circuit Not Working on 2007 Toyota Tundra  

Question:

I purchased towing lights to put on a trailer. When I turn on the lights from my truck, the towing lights work. When I use the brake, right turn signal or hazard lights, the right side light does not work. I also connected my truck to my boat trailer and the same thing happens. I purchased a new connector for my truck and replaced it. Still having the same problems as mentioned. What am I missing?

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Expert Reply:

It sounds like you are having issues with the right side trailer brake/turn signal circuit on your 2007 Toyota Tundra. If that is the case then the first thing I would check is the fuse box for the right side trailer tow stop/turn signal fuse and or relay. The fuse you will be able to tell if blown but for the relay you will need to swap this one for one you know works in order to rule this out. I looked in the owner's manual and did not see any specific fuse locations so it should be printed on the underside of the cover.

If the fuse/relay is in working order then I would turn my attention to right side stop/turn signal wire. I recommend you trace this back from the trailer connector as far as possible while checking for breaks. If none are found then the last thing I can have you check is your ground for the trailer connector. I recommend you remove this ground, sand the surface down, and then reattach with new hardware.

If none of the above steps seem to fix your issue then you may be better off just taking the vehicle into a shop for diagnostics.

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