I've checked the trailer on another vehicle and all the lights work. When I hook to my explorer (2003 xlt V8) everything works except the running lights... is there a fuse for this? Any hints would be appreciated.

 

Yes,, the trailer park/running lamps are somewhatisolated from the tow vehicle and relay controlled.. The fuse is in the BJB (battery junction box) under the hood.. It's a 20amp fuse in position F1.27 which is 'almost' dead center in the panel/box.. Your owners guide will show the exact location..

 

I found the blown fuse. Thanks!

 

Glad it was a simple fix...