Ok, this is a straightforward system - power from the fuse to the switch and then to the motor. You need to check for power to the motor. If not present, then check for power out of the switch. If none out, new switch is defective out of the box. IF 12v present, then short in the wiring between switch and motor
If 12v is present, then either the new motor is defective out of the box, which happens more often than we would like, or there is severe wear in the linkage bushings which wasnt picked up on. So check the linkage bushings carefully and replace any that are worn or missing. If linkage and linkage bushings are all good, then it is simply a defective motor out of the box.
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