I have a 2003 that I have used to tow and haven't run into a lighting issue until now! I hooked up my boat two weekends ago and the wiring is not good on the trailer - only running lights were working but there were broken wires to lamps etc... Then last week I was towing my brother's boat and didn't have any running lights everything else worked fine. I figured it was his trailer. Now I have a different trailer again (#3) hooked up and again no running lights. Searched this site and found a post on "TRL PARK" fuse. Checked it and it was bad. I replaced it and still nothing for the running lights. I have cleaned all connections and everything works but running lights?? What am I missing? 
