Also, look for something that looks like this somewhere in the vicinity of your batteries or on the A-frame. Your battery plus wire probably goes into one of these. There's a self-resetting circuit breaker under the rubber cover. The battery wire should connect to the copper terminal and the house wiring connects to the brass terminal. You want to install the cutoff switch downstream of this device to maintain protection at all times.
2012 Dutchmen Denali 289RK
2013 Ford F250 Lariat - 6.7L Powerstroke Diesel