Test this connector for power. Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. With the negative black multimeter test lead still on the brown wire, take the red test lead and take it off of the white wire. Post #1. Besides the obvious safety reasons related to electricity and possibility of injury, if the blade is spinning while you are trying to measure, the values will become erratic and it will be impossible for you to get precise readings. You'll probably see a resistance of about 0.6 Ohms ( Ω ). You can check the resistor resistance with an ohmmeter or digital multimeter. How do I test a blower motor. Newbie Group: Members Posts: 6 Joined: 5-November 07 Member No. Bulging, or fluid leaking out of the unit, are common signs that the capacitor should be replaced. If the resistor is in circuit, you will generally have to remove the resistor so you are testing only the resistor value and not the other components in the circuit. Blower motor resistor failures testing and. Locate the fuse for the blower motor in the owners/service manual. Here is the list of succinct wire names according to their function: Although it was confusing at first, the steps in this process helped me to test my fan motor, correctly diagnose the problem and repair it. hide. Values measured in this step should be around point one or point two ohms. Test the fuse, with the ignition key on, using the 12-volt test light. Most common of these are single phase motors. Normally if a resistor fail they will either increase in value or open up at all (open circuit). Your email address will not be published. Post #2. If there is no power indicated on high blower speed, the problem is most likely the switch or the fuse. http://www.wellsve.com/ This video demonstrates how to interpret the wiring scheme for the blower system on a late model GM truck. Checking the continuity of the resistors of the resistor assembly. If the multimeter identifies a current, then further testing of the blower motor is needed. Dec 23 2007, 11:38 PM. Testing the blower motor resistor with a multimeter is a simple way to determine if you need to replace the resistor. 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