[emt1134]

This is hard since I cannot see what you are doing...

- Test your voltages with the vehicle running, so you know that the decreased voltage readings are not due to the battery draining as a result of the alternator not running.

-Make sure the blower switch is on HIGH

- Make sure the positive lead on your voltmeter is reading batter voltage, should be around 13V since you have the vehicle running now

-Put the other lead on the ground terminal of the connector on the resistor module that connects to the blower motor... Now you should see that same 13V or so... Tell me what the reading was before you connected to that ground circuit, and after.