Hi, I know this is an old post, but its very relevant to my problem. I have done all the checks above, and have confirmed my motor is working okay with the hotwire test.
I have 12.6V on the live wire in the 3 way connector, and continuity on the other two back to the two positions on the control lever in the cab.
I also have continuity from the wire that connects to the cab control lever, to the wires connecting to positions 1 and 2 when lever in relevant position.
Still no blower! Any ideas what else I can check?