18
Oct
Silverado Blower Motor Resistor Test. Using a multimeter set on the Ohm scale use the positive lead and test the black wire. My blower motor has been working fine until today. Causes of a Bad Blower Motor Resistor. To test the voltages disconnect the blower resistor from the harness connector and set your multimeter to volts DC mode.
If this circuit is open showing infinity on the Ohmmeter the blower resistor must be replaced. I had the key on the whole time. From the forum I thought it was the resistor pack so I replaced both the pack and the pack connector. Blower Motor Test 1994-2003 22L Chevy S10 GMC Sonoma. Some 1994 ChevyGMC pickups use this type of blower resistor. Place the other lead on terminal 2 and check against specifications.
Tested motor with DC 10V and 14 volts and operates fine.
Attach the clip lead of the test light to a good ground like a bolt screwed into metal and touch the sharp probe end to the terminals on the fuse. Next turn the key ignition to the on position set the blower speed knob to low and verify that terminal A of the blower resistors connector has 12 volts DC with your multimeter. I have a 05 Silverado 1500 with the LS package. Blower Motor Resistor Basics. The blower motor works on Speed Settings 1-4 just fine but does not work on high speed. Attach the clip lead of the test light to a good ground like a bolt screwed into metal and touch the sharp probe end to the terminals on the fuse.