The running boards stopped working a couple of days ago when it was raining. Today I unhooked the electrical connectors on each side, sprayed the inside with electrical contact cleaner, mashed in some fresh dielectric grease, then snapped it back together.
Then I noticed that the insulation of one wire had worn through to the copper wire inside. So, I covered the back end of the connector and the exposed wire with liquid electrical tape, then wrapped the entire connector from the connector to the plastic wire conduit with electrical tape. I'm going to hope, for now, that the main problem was electrical. I may have to remove the running boards and clean up the insides of the motor itself, but when it works, it works well. When it doesn't, it just doesn't, so I suspect it was electrical and not the motor.
Larry