If your RV step fails to operate, the cause will either be an electrical, wiring, or mechanical problem.
Testing The Step To Find The Problem
Locate the four pin connector that powers the step. Follow the procedures outlined in the Lippert Kwikee Step Owner’s Manual for testing the power output (red wire) and switch control voltages (other 3 wires) from the magnetic door switch, override switch and ignition switch.
If the four way connector test passes, then your RV is supplying the necessary power and the switches controlling the step are functioning properly.
Next check the output from the control unit to the step motor. If the step does not expand or retract, then disconnect the switch to the motor and check the positive and negative wires for a 12V signal when the step is triggered. If the step motor is getting power, but not operational, then the motor is likely faulty and needs to be replaced. Follow the steps below to replace the step motor.
If the motor makes loud noises when operational, then replace the motor. I determined that my motor was the culprit. Sometime it worked and sometimes not.
- Kwikee Motor Replacement Kit I Purchased for My RV
- Full list of Kwikee Step Replacement Parts on Amazon
It is unlikely that the gear assembly and control unit will go bad. But follow the testing procedures outlined in the manual if you suspect a problem with those units.
- Lippert RV Step Owners Manual / Testing and Troubleshooting Procedures
- More Kwikee Step Technical Manuals from Lippert
Replacing The Motor
Here are the steps to replace the motor assembly.
- Disconnect power to the step
- Disconnect the power plug from the motor assembly
- Using a 10mm socket, remove the 3 screws holding the motor assembly
- Lower it straight down being certain not to drop the gear, washers and pin on the gear assembly side of the motor
- Move the washers, gear and pin to the new motor
- Apply new grease to the gear if needed
- Insert motor assembly into gear box and insert the three screws
- Tighten the screws down with a 10mm socket
- Reconnect power plug to the motor assembly
- Reconnect main step power (four way connector) while staying clear of moving parts
- Test Step operation