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I didn't read it in a TM. I seen it several times in real time. I grab every switch pigtail I come across. I had it on many snow plow trucks also that are not CUCV but have the same switch. All GM vehicles during that era had the same pigtail and switch some were just reverse set up. You are...

You may have to replace the harness from the switch to the resistor. It is a poor setup and is prone to getting a bad connection over time. Some do and some don't.

Also note the wiring pigtail that runs to the fan switch and resistor under the hood on the heater box has a tendency to have a bad connection and gets hot and melts the switch. It is loose and makes resistance and heat. Make sure the connection is tight and apply some dielectric grease on that...