Re-read my test.
The red wire is always HOT w/key ON..
The REG simply grounds the motor [ called a SWITCHED ground] using the blu wire.

SO, knowing that, if you simply ground the blu wire from the motor , you have by-passed the regulator/control circuit.
Grounding the blu wire coming out of the motor is the same as if you took the motor out and hooked it up to a battery DIRECT...but why do that if you can do it by simply grounding the blu wire ???
My post didn't go into the WHY , it is just the first of a sequence of TEST.

The first one being . "Ground the Blu wire"

If the motor runs, you have a problem in the control side of the circuit, most likely the reg.
If it does not run, you check that you have 12v at the red ..If you do , you have a bad motor..if No, then you have a bad strip fuse.