2019 Trailer Light

My Tundra is at the dealer having a trailer light issue fixed. The Left Turn signal only at the 7 pin plug truck side stays constant 12 volts when left turn selected. The truck tail light works great. The right turn signal works correctly at the 7 pin plug it flashes. They are saying the instrument cluster is the issue and needs to be replaced. They are saying that a shorted wire on the trailer is the common issue. I would think that the circuit should have been protected by a fuse if not this would seem to be a bad design. Has any one ever heard of this issue?

 

Just got back from the dealer. I had to replace the instrument cluster. Apparently, if your trailer has a short it can fry the circuit in the instrument cluster, now I’m afraid to connect to a trailer. I would think the circuits should all be fused in order to protect the truck.

 

Why not add a fuse then?

 

I plan on putting in-line fuses on the trailer circuits. I was under the impression that they were fused since everything was factory.

 

I’m pretty sure they are as well. I hook up to some pretty sketch trailers often. Can’t believe that you can fry your cluster with a trailer short.

 

I also found and older thread on this site reporting the same issue. The tech says he has seen it before. I put the link to the other post.
https://www.tundras.com/threads/no-right-side-trailer-turn-stop-need-a-cluster.141316/
I’m thinking of building a fused pigtail so that I don’t have to cut the truck installed harness. It will be cheaper than a new instrument cluster. I have several trailers that I use.