[pfofit]

Hello.

You cannot read the motor voltage with the motor disconnected.
It's based on ohms law. the resistor is meant to drop the the voltage to the motor. Essentially, no motor means no current flow (except for the minuscule meter current ), therefore no measurable voltage drop. No voltage drop with be basically battery voltage. Try to measure the voltage with the motor connected. I know it helps to be a contortionist.

To test the resistor block, you will need to measure resistance and either have a wiring diagram or poke around. It will only be up to a few ohms (maybe 5) and will increase/decrease by say 0.5 ohm per change in speed depending how you measure it.

If your plenum dampers are functioning then check for plugged cabin filter etc.or watch the motor outside the airbox. You said you can here the speed change but no airflow, I think you need to verify the motor or dampers is your problem.

However, If you try to run the motor out of the plenum , hold the motor base as it will spin hard/twist under high speeds and do not run it too long outside as the resistor needs to be cooled and it gets its cooling from the squirrel cage air flow while they are inside the plenum.

cheers