You have a short somewhere. I would start with checking your ground wires from the main fuse box to the frame, battery to frame and to the slide. If they check then I would look for loose wires at the switch(s).
Also, check that all the wires running into the main fuse box are tight, they can loosen up or not be tightened properly at the factory.
A long time ago I had a short in a car. A guy had a radio direction finder and kept running pulses through the wiring harness until he found a rear marker bulb socket had a short. (radio waves from sparks can be traced).
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