OK first thing spool some line out, then what i would do is take the 2 wires off contactor running to winch, touch those wires directly to the + and - battery terminal winch should move the winch in one direction or another , then reverse the wires that you touched to the battery and see if it moves the opposite direction as it did the first time. If it operates in both directions the problem is inside the contactor, IF you dont have the slack in the cable to touch the battery reverse them on the contactor after that the winch should spool out and not in. Hope this helps