I have an '05 HSE to which I added a towing wiring harness. From the start, the right turn signal and brake light worked on the trailer (4-pin harness); the running lights and left signal/brake light were dead. I dug around and found that fuse 14 behind the glovebox was blown. Replacing that revived the running lights. More digging and owner's manualing led me to spend several fruitless minutes looking for the "supplemental fuse block" for towing electronics in the left rear panel where the tow hitch normally resides. I found no such block, then went to Google and found one reference here to the towing fuses actually being behind the glove box. I see only the main fuse panel there, which had only the single blown fuse (which wasn't labeled running lights). I don't see the six fuses mentioned in the manual.

Any ideas?

Rich