Hi,
Without a wiring diagram all I can say is, try connecting a 12 volt supply directly to the motor terminals. If the motor runs, you're looking at a wiring/switch type fault. If you have a meter and you've established that the motor runs, you need to do a continuity check of the wires leading to the motor from the switch and/or the fuse panel. The last thing could be the switch itself, try using a shorting lead to override the switch and see if the motor runs.
Cheers now
Ken Chapman
April 2007