Wes,
The first thing that you need to check is to see if you have 12 volts at the wiper motor when you turn it on. If there is 12 volts on the hot wire going into the motor and you have a good ground (be sure to check the ground), you have a bad motor. However, if there is no current to the motor, you probably have a circuit breaker or switch problem. Depending on how your coach is equipped, you could even have a smart wheel problem. You just need to check the circuit to see where the power stops at.
Gerald