I just used a piece of lamp cord and bypassed the fuse to see if the motor was seized or shorted.

The motor came on and sounded OK, but. the lamp cord started to warm up as I was holding it in place.

The fuse is supposed to blow at 30A x 12V = 360W. That much power should not be heating up a 110V lamp cord.

I am going to pull the blower motor and have a look. I need to find the thread for how to do it.

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1991 350SD (updated rods)
Biodiesel B100 when I can find it.
Dino when really cold outside