Couple things. Does the parking brake light on the dash come on when you engage the parking brake? If not, you have a bad switch on your mechanical parking brake the slide out and jacks won't work unless the brake is engaged and it creates a ground to your control panel. Second thing the sister runs off your coach batteries if the coach battery is no good that's why the previous owner said have it running to get enough juice through the system to work your slide have the coach batteries inspected and replace if necessary.
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