A window regulator for a motor vehicle door assembly including features for providing defrosting capabilities for movable glass of the door. A door wire harness is routed inside a door inner cavity. A defroster wire harness is provided having a first end connected to the door wire harness at a bracket on a window regulator guide rail. The opposite end of the defroster wire harness is affixed to a second bracket at a window regulator window carrier. Electrical defroster element wires are connected to the defroster wire harness at the second connector. The defroster wire harness is configured to undergo a bending motion in a manner to reduce fatigue and interference with internal components of the vehicle door. Other applications include providing electrical power to electronic or electrical elements carried by a vehicle movable window panel in addition to defroster functions.