How to disconnect battery?

Hi all—just purchased 1997 Pleasureway and can’t figure out how to disconnect the house battery when the coach is not being used. Carbon monoxide and propane detectors are on and I want to disconnect the 12 power so the coach can be parked until we use it again. There are circuit breakers that reset, but pushing the reset button does nothing. Anyone out there with experience with an older Pleasureway able to steer me in the right direction?? Thanks!