Ford Parts 7C19-V23201AB-SD Front Left Window Regulator for Ford Transit V348 On a Transit V348 / New Gen Quanshun, the front doors use a cross-arm regulator riveted inside the door skin, pulled by a 12V 2-pin motor. Years of fleet work — a stiff guide channel, grit in the rail, one hard pothole — and the rivets loosen, the arm binds, the motor screams then trips its overload. The glass tilts, jams half-way, or sinks overnight. Swapping the door switch won't fix a bent arm.