1. Changing the magnet will not affect the ignition or kill switch
2. IF you installed the wrong magnet polarity, the step would operated in reverse. Retract when door is opened and extend when door is closed. The magnet just opens and closes a GROUND signal to the control module
3. Making the steps stay OUT with Ignition OFF and door closed is a 12 volt switch problem on the inside of the RV
4. Retracting the steps when the Ignition key is ON and the door must be closed, is a 12 volt problem on the Ignition side YELLOW wire.
5. So, you will have 2 problems if you have items 3 and 4 not working, and both will not be a magnet caused problem. Doug