I have been trying to troubleshoot an exterior light problem on my son-in-law 2011 Dutchman trailer. The two exterior lights do not work. I checked the switch and it was okay. I changed the fuse for t...
Check the ground at the fixture...typically the neutral wire is just pop riveted to the tin metal on the back of the fixture and corrodes easily. Common issue with tail lights also. Lack or ground in the circuit would prevent that "fuse out" light from working normally.