Tail lamp out message

[EdGs]

Update:

I could not find anything obvious in looking over the wiring, etc.

However, I have had no more dings with the "right rear turn signal out" message.

Have not a clue as to what changed, unless the movement of this and that corrected something.

 

[GTyankee]

If i recall correctly
Everything inside of the cab, from the front seat to the rear cab wall runs under the drivers side door step cover, both front & rear
You can open either door & remove the step cover & then maybe lift a flap & then you can see the wiring
The 3rd Brake light wiring runs above the rear window & down along left side rear seat belt harness, it joins the rear sliding window wires & the Radio Frequency Module, ( the part that makes your FOBs or Remote Keyless Entry ) work.

I don't know where the wiring for the Overhead Air Bags, both sides above each door runs, or just where the Power inverter wiring runs, if you have that option