Figures... I didn't remember that the resistor pack was between the motor and ground.. I left for work without the schematics I got from the Mitchell On-Demand CDs two days ago, I should've brought them with me.
I'll be on holidays in a few hours.. hopefully that'll give me time to check further on this.
I'm wondering what would happen if I applied 12v directly to the motor? If it does work that way (like in the thread you mentioned earlier) then it's probably something else than the motor...
Junk yards are asking 72$ (CDN) for the motor (searched on
www.car-part.com, I hope I can find it cheaper.
Again, thanks for your help!