There's three motors. Front, rear, and forward / rearward. Switch failure is more common. A quick test is to swap the electrical connectors between two motors to see if a different motor runs. If the same switch is dead, suspect the switch. If the same motor is dead, suspect the motor. You can also measure the voltages on the two wires of the dead motor, but to be accurate the connector must still be plugged in. If you find 12 volts on both wires or 0 volts on both wires when the switch is pressed, it is defective. If you find 0 volts on one wire and 12 volts on the other one, the motor is the problem.
Sunday, February 27th, 2011 AT 2:21 PM