Just had the same sort of slide problem and found similar numbers doing checks. It turned out to be the slide switch itself which has contacts inside it that were going bad. It seems this is a common problem. Replaced the switch and all is good. All the battery power passes through the switch on the way to the motor.
In addition, the switch input neg wire came from a connection to the frame. This connection was corroded. Unknown whether that was a poor contact, but cleaned it all up anyway.
We had the earlier version of the Lippert switch and the new one has different wire colours. Lippert website has the diagram on how to match up the wires going from old to new.