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Warn Winch assy.  Item #38 is a thermal cut-off switch which will prevent the motor from over heating. Item #33 are the solenoids the control the current to the motor. In this drawing the "Electronic Current Limiter" is not shown, and if this device is open, will prevent the winch from pulling in the cable.
Part list to the above drawing
Wiring of the Warn Winch. Note that this drawing down show the connection of the "Electronic Current Limiter", the item I believe will be where the problem is when the winch will not pull in.
 
The Following is for Emergency ECL Bypass only and is only to get you by in the event of an emergency.  This information came from Warn Sales.
 
EMERGENCY  ECL  BYPASS

The loss of the "power in" operation may indicate a malfunction of the ECL.  The control pack circuitry should be tested and necessary repairs made to the system, as soon as possible. Operation of the winch with the ECL bypasses can result in overloading the winch and cause the wire rope to break.  EXERCISE EXTREME CARE when using the winch with the ECL bypassed.
 

  1. Remove the three screws holding the control pack in place.
  2. Carefully lift off the cover.
  3. Locate the green and yellow wires that that connect to the ECL printed circuit board.
  4. Cut the green and yellow wires free from the circuit board.
  5. Remove about 1/2" of insulation from the free end of the green and yellow wires, Twist the bare ends tightly together and insulate then with electrical tape to prevent short.

  6. If the ECL was the source of the problem, the power in function should now work. Replace the ECL as soon as possible.
 
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