[The cap'n]

There are TWO wires going to the motor. One, the brown one, is ground. The other one, green, is the 12v+ source. The motor doesn't reverse, so there's no need for a third wire. ground the brown wire, apply power to the green wire. If the motor moves, then it works. if it doesn't move, then it doesn't work. Occasionally,it may need a little help. Turn the plastic knob on the end in the direction indicated by the arrow. IIRC, it's not a good idea to turn it the other way with power connected.

The Cap'n