Didn't see this coming, BLOWER INOP!

[Airjer_]

I had an intrigue in the other day (2002) with a blower motor inop. No problem unplug the connector on the blower resistor and check for power from the switch on all the small wires, Power up the blower, and make sure I have the appropriate power and grounds. everything is as it is supposed to be so I condemn the resistor, wrong!

As it turns out I was losing the power supply to the switch under load. Which means with the resistor unplugged I had a bright test light in every switch position. With the resistor plugged in the test light was very dim? I just happened to stumble on to this while probing the fuse with a test light. With everything plugged in the test light was dim at the fuse, Unplug the switch or the resistor and the test light was bright.

That power came from the ignition switch which is powered by a main fuse. The ignition switch supplied power to the low blower fuse, HVAC fuse, and cruise control. The power supply into the switch was fine and sure enough the power out barely lit up the test light. A new ignition switch fixed this one!

Its always humbling when you get schooled on something you do so often!!