I don't know how it happened. I bought it that way. But the Dimmer Switch is melted. I'm hoping the guy that owned it before me didn't try putting in a bigger fuse 'cause the 10A fuse kept popping. I really don't feel like huntin' down a short. I hope the dealers' isn't expensive, but I'm not holdin' my breath. Otherwise, I'll have to go to the junkyard and cross my fingers I find a pickup like mine with a good dimmer switch.