Bigbird: I'm just guessing, but this is how I think the switch works. The red and white wires on back of switch are hot and ground. The green and blue center wires go to the motor - one goes to the motor and one comes back from motor to switch. In one switch position, the red hot wire is connected to the blue wire to the motor and the white (ground) wire is connected to the green wire from the motor. In the other switch position, the connections are reversed - red to green and white to blue. This causes the motor to rotate in one direction in one switch position and the opposite direction in the other switch position. If I'm correct, don't jumper the red to white - you'll be shorting your battery terminals and create a lot of sparks!
Ken