Since I was unable to get my hands or the meter probes into the tight spot where the hard-mounted side of the connector resides, I picked up the same connector with wires attached from a local auto recycler. This allowed me to plug into the firewall connector and easily access the wire stubs with my meter.

Protocal:
-Key on, engine running
-Defrost position selected and depressed
-Fan speed set to high
-Wheel set to 85 degrees
-Engine not up to operating temp. since "key on" only was suggested

Results:
-Red to Black, 14.4 to 14.7 observed
-Yellow to Black, wildly erratic and non-sense readings observed

Is a new fan regulator the next step?
Thanks