New 12V continuous duty reversing polarity contactor solenoid. New 12V DPDT continuous duty reversing polarity contactor solenoid. This switch reverses polarity on two terminal permanent magnet motors, such as dump truck tarp motors, winches, windlasses, etc. Four 5/16"-24 threaded studs, Two 1/4" male blade terminals. 150 surge amps, 75 amps for 5 minutes. Wiring instructions are included.