Originally Posted by Dcalvery
The socket on my porch light came apart and blew the circuit fuse. After finding my fuse box and replacing the fuse the porch light the new porch light fixture still did not work. I spliced the white and black fixture wires to the appropriate wires. After much todo i discovered, looking at the wiring diagram, that the hot 12volt wire was attached to the ground wire on the fixture. Splicing the black wire to the white wire and the white wire to the black fixed the problem
Lesson learned. Most automotive lamp sockets have a black wire for the ground and the 12 V. wire can be any color. Often it is white though.
For some unknown reason RV's reverse these colors. No rhyme or reason, they just do. They seem to follow 110 V. wiring which uses black as the hot wire and white as the neutral which is grounded anyway.
I had a friend who whacked three radios in his TT before he called me and asked me to look at it. I hooked it up and the forth radio worked fine.
Radio Shack had three radios returned as defective.
I charged him a thirty pack of PBR and we consumed it right there!