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      • A: Take the GREEN wire and temporarily attach it to the positive side of the battery. This should activate the fan. If the fan comes on there most likely is a problem with the connection on the YELLOW wire/Manual Switch/Thermostat. If the fan does not come on remove relay and reinstall making sure it is seated correctly.
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  2. If for any reason you are having issues with the installation of this fan controller, please refer to the TROUBLESHOOTING section on pages 3 and 4 or view our tech tip videos on our website. Please go to and search Part # 16795Derale.comscan this QR code: MAXIMUM CAPACITY: 65 AMPS.

  3. Jun 17, 2016 · Testing Derales PWM Fan Controller: No More Shocking The System. By Michael Harding June 17, 2016. Think about the last time one of your light bulbs burned out in your home, it was probably immediately after you turned on the light, right?

  4. If the electric fan has not turned on, take a Screw Driver and turn the Adjustment Screw counter clockwise in small increments until the first fan starts. Allow the electric fan to run and shut off automatically, and possibly cycle on again. If the electric fan turns on too early, turn the Adjustment Screw clockwise.

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  5. Nov 3, 2015 · The thermistor sensor in the water pump housing was turning the fans on full blast (100 percent) at 195 degrees, and turning them completely off (0 percent) at 175 degrees—meaning we were hitting...

    • Johnny Hunkins
    • 6 min
  6. Jul 30, 2014 · Pulse Width Modulation (PWM) Fan Controller Module. Thermal fan clutches work on the principle that the fan doesn’t engage fully until the temperature rises. The fan essentially ‘freewheels’ until the air is hot, then the fan clutch is engaged and the fan pulls more air through the radiator.

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  7. Troubleshooting - in the event the fan controller is not performing properly follow these tests in order: 1. Check that all wire splices are crimped properly and that all connections are solid.

  8. Page 1 TROUBLESHOOTING section on pages 3 and 4 or view our tech tip videos on our website. Please go to Derale.com and search Part # 16795 scan this QR code: MAXIMUM CAPICITY: 65 AMPS This controller will operate multiple fans with a combined maximum amperage up to 65 amps.

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