Is there a separate fuse somewhere for the trailer wiring harness. My oem hitch was on the vehicle when I bought it so I don't know. I drove a trailer with messed up lights a year ago and since then my left turn signal flashes like a bulb is out (but it isn't) and my mirror won't fold down in reverse. I cannot find and fuses that are bad in the front compartment or the rear passenger side main box. I'm wondering if there is one I am missing.

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2004 e53 m54 with 6spd manual