Ay have a bad switch or short/break in a wire somewhere. You may need to get a volt meter and find where you have power in the lines and follow them back to see where it loses power.
1994 Ford Mustang GT
1990 Ford Bronco II
2001 Lincoln LS V8
1970 Ford Bronco
2006 Harley-Davidson Sportster Custom
If you don't already own a Ford (or Ford owned product), get one.