I have an SLT30 S/N 46603d30394

Back up beeper doesn't work, chased wires from beeper, power wire goes into a connector with other wires, on the other side of connector where beeper wire goes, there is nothing, no wire, no pin. Can't find a loose hanging wire or anything and custy says hasnt' worked in at least 3 years...so question is where is the power wire come from if i'm gonna try to rerun it is off the direction switch? any help is appreciated!

Thanks Dudes and Dudettes