1. Faulty Fan Switch: If the fan switch is faulty, it may not be able to properly conduct the 12 volts to the fan motor. Check the switch for any damage or loose connections and replace if necessary.
2. Faulty Motor Ground: The fan motor also needs a good ground in order to complete the electrical circuit. Check the motor ground wire to make sure it is properly attached to a good ground location.
3. Fan Motor Failure: If the fan motor itself is faulty, it may not be able to run even when it gets power. One way to test the motor is by applying power directly to the terminals of the motor, bypassing the fan switch and wiring. This should isolate the problem to either the switch or the motor.
4. Incorrect Polarity: Make sure the polarity is correct when connecting the wires. If the positive and negative terminals are connected incorrectly, the fan won't run.
5. Wiring Issues: Check the wiring connections between the blower connector and the fan motor. Make sure the terminals are clean, and the wires are not loose.
6. Blower Motor Resistor: If your blower motor has a resistor, it may be faulty. This can cause the blower motor to run at a reduced speed or not run at all. Check the resistor for damage or loose connections.
If you have verified all of the above and the fan motor still does not run when connected to the blower, the issue may be with the fan motor itself. You may need to replace the fan motor to get it working again.
