I still think my problem has to do with the Purple wire (Ignition 3 Voltage Circuit) not registering enough voltage to power a simple test lamp (6v-12v).
I followed the test descriptions you sent. Here are my process responses.
Step 1. Reviewed auxiliary HVAC operation and moved to Step 2
Step 2. Performed auxiliary blower functions but does NOT operate at any speed setting of the front and rear blower motor switches.. Got to Step 3
Step 3. Disconnected Auxiliary blower motor, turn ignition ON with engine off, connected a test lamp (and Volt meter) between the auxiliary blower motor supply circuit (Red wire from blower motor resister module) and a good ground and Test Lamp did not illuminate (voltmeter read 00.4V)... go to step 6.
Step 6. Disconnected the auxiliary blower "motor resister" assembly connectors, probed Ignition 3 voltage circuit (Purple wire) with test lamp connected to a good ground. Test lamp DID NOT illuminate. However, It did illuminate when I probed the Battery Positive voltage circuit (Orange wire). Go to step 15.
Step 15. Repair the ignition 3 voltage circuit of the auxiliary blower motor resistor assembly. Need to refer to "Wiring Repairs" in wiring systems but the referenced Hyper Link does not work. Can you provide Wiring Repairs instructions? Thanks. Also will need Test Description Steps 21 and beyond. Thanks.