Thermal Switch Test
WARNING: This page is about a different car, the 2011 RAM Pickup and 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
The motor will not power-in if the thermal switch is open or if its terminals are in contact with the motor case. The switch should normally open when the temperature at the motor brushes reaches 205+°C (400+°F).
If the Thermal Switch is suspected to be failing check the following:
- Disconnect the switch.
- Measure the resistance of the switch at the electrical connector.
- If the switch is open at room temperature then replace the motor.
- If the switch is closed then the switch is good.
- Check for resistance between both terminals and the motor case.
- If the resistance is less than 1 megaohm then the winch is grounded. Replace the motor. Refer to MOTOR, Winch, Removal .