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Hi my name is Robert.....
I would look near the battery and make sure you do not have an auto breaker tripped, below is a picture. On many setups the slideroom motor is wired directly to the battery and sometimes you will find that auto breaker, Most have a small tab that pops out on them when they trip. As a general rule they like to stick them 18" from the battery and can be on the frame. You might have more then one, to test with a meter you should have voltage on each post to chassis ground. The power for the switch should come from the main fuse panel inside. Sometimes between the switch and motor you will have a relay board. Hope this helps some....Robert
Normally the switch gets power from the fuse panel, and then when you hit the switch it allows power to the motor and motor is wired to the battery. IF you have no voltage at the switch then it could be a problem with the wire from the switch to the fuse panel. It would be hard for me to say where the problem would be on that wire. I would verify the fuse for the slide-room has power and then I might try to ohm that wire out from the fuse panel to the switch. IF you want to try another expert on this please let me know.... Robert