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Discussion Starter #1
I've read a LOT of the discussions on how to appropriately wire your Titan for trailer/tow hookup and I am frustrated where I am after a lot of work.

I've recently bought a 2014 Titan CW/SV 5.6. The previous owner had a 7 way round aftermarket trailer plug mounted to the truck and for some reason, cut the wires just near the plug. I also went to O'reilly's and picked up a new 4 way flat plus 7 way round plug to mount onto the truck near the hitch. After figuring out the colors for the plug and the colors for the truck on their respective wiring diagrams are VERY different, I hooked everything up and had brake lights working fine, no tail lights, and my turn signals between the truck and trailer were reversed. I also noticed my left tail light was out so I stopped my project for that evening.

Returning to the job, I swapped the turn signals and read several discussions about a fuse for the trailer/tow/left tail light that was in a very awkward spot. Then after learning to be a contortionist, managed to change several blown fuses and have checked what I believe to be every fuse and relay in the truck (including the box under the passenger side dash). Trailer tail, turn, and brake lights work just fine but the left tail light on the truck does not work no matter if the trailer is hooked up or not. I've even grounded the ground connection of the truck and trailer to the frame, swapped tail lamps, yada yada. This is frustrating the heck out of me because I bought the truck specifically to tow a trailer, and I've already been pulled over a couple of times for the tail light. If anyone has any ideas, I'd greatly appreciate them.

C
 

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This is a long shot, but does your truck have a exhaust leak where the tail pipe connects to the muffler? A leak in this area can cause hot exaust gasses to be directed up towards the bed right where the wiring harness for the back of the truck comes through. I know of at least one person who had the wires melt because of this, and lost tail lights.
 

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This is a long shot, but does your truck have a exhaust leak where the tail pipe connects to the muffler? A leak in this area can cause hot exaust gasses to be directed up towards the bed right where the wiring harness for the back of the truck comes through. I know of at least one person who had the wires melt because of this, and lost tail lights.
I thought they fixed that and 2014's won't have that issue.
 

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Discussion Starter #5
Thanks Mac's Hack Shack, I will check that. The truck has seen some mountain-area miles and the muffler does need replaced due to salt corrosion. I will check to see if the left tail wires route through there.

Thanks again.
 
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