A/C Blower Fan Issue

[TheApocalyptican]

Originally Posted by Evil Trailblazer SS

Okay, so every single wire on the resistor harness has full voltage all the time, no matter which speed I set the blower motor switch to inside the cab.

I pulled the heavy purple wire from the blower motor itself and the test light was very dim on LO, MED, MED HI with no change between all three settings and then when I switch to HI, the test light goes full bright.

I am sorry but I don't have my multimeter handy right now, so I don't have specific voltages to report...
Posted via Mobile Device

Specific voltages aren't necessary. The fact you have full voltage at all the wires say that the problem is either the switch or the wiring between the switch. If it were me,my next step would be to unplug the fan switch and use a heavy gauge wire to jumper the pins at the connector together one at a time to see if the blower then changes speeds.