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You need a vom. A cheap volt-ohm multimeter will zero you in on the problem really fast. Start at the battery and move out. Your battery should be 13.8v when the camper is plugged in. If it is any lower than 12v even when not plugged in you have a battery or charging problem. Run a jumper wire across that rusted circuit breaker and see if everything works. Go to the silde out motor and check for voltage. It should be the same as the battery when the trailer is plugged in. Check all the fuses with the ohm meter after unplugging them from the board. It is the only way to test them. Make sure they are all plugged in between the contacts and not missing them on one side. Turn on all your lights, and pull the fuses out one at a time when testing and see what goes off. If you find a fuse or fuses that do not have an obvious affect, one of those circuits may be the problem. The slideout fuse should be a high amperage one. Don't just look at the ground. Test it with an ohm meter. Looks are always deceiving. IMHO: You probably have 2 problems. 1) The switch or breaker for the slideout. 2) Bad switch or fuse for the lights.
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