[ThePidler]

Even if it's the wrong fuse, 12 volts to both sides is wrong...no fuse needed, (FIRE!). Sounds like you have some cross wiring. The Lucas lights could be it. Start pulling other fuses and see if one of them causes one side of that "dual 12v" to go out. If so, you at least know which circut. If you need some help, give me a shout, be glad to come by again. Sometimes two is better than one!

greg