Originally Posted by Phil57
I believe that the ignition safety as several have suggested is a good place to look. I didn't understand all the ways to check but it sure seems to be a starting point. I also think it is something simple. Is there a sensor or a trip switch that is triggered when the slides are out. Silver is thinking its a relay. Could be but it failed when trying to move the slides. Relays are so bullet proof. It could be but I would be surprised. The ignition position is a good starting point. That turns the power to the slides on and off.
I do not think the relay is bad but perhaps the circuits feeding the relay. Ether the control coil (controlled by the key on) or +12V on the normally closed side is gone (normally closed as a designer would not require energy on relay to operate the slides while coach is sitting only to disable when coach is running). Kenny feels sure that this is the control relay for the slides so this makes sense. That is how I would have designed it in my day. Once measured we would know where to trace back. Additionally if the +12v is missing on the normally closed side of the relay because a wire fell off or a hidden fuse is blown we could provide it from another source. That was why I suggested the paperclip idea and +12V source through a 20 amp fuse.
Without data it is only a guess.