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Hi my name is Robert...
Sometimes they will use a breaker in-line from the battery to the slide rooms, below is a picture, most have a small tab that will pop out when they trip. As a general rule they like to stick them 18" from the battery and can be on the frame. IF you see any the voltage on each post should be the same, you would measure positive on the post and then negative to chassis ground. You also might have more then one so If you see any check them all. They also could be using a fuse.... Hope this helps some... Robert