First, make sure it's not the fixture. Switch it with the one that does work correctly. If it stays the same it's in the wiring, if not then it's in the fixture. Once you have that resolved, take a test light and check each wire to ground of your trailer to make sure there's no short. If there's no short then it's in your plug.
__________________
1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
|