Doublecheck your wiring on the LP detector. MOST of the solenoid activated LP detectors, have 2- 12 volt inputs. 1 is for the chassis 12 volt and the 2nd is the coach 12 volt. Years ago the OEM's used BOTH inputs correctly. Years later, they connected BOTH 12 volt inputs together to the coach 12 volt supply. If only Black and Red inputs, then you have the newer style. BTW, most OEM's did NOT like to connect the LP detector to the Battery Disconnect. They wired the LP detector direct, because you could still have an LP leak with the battery system turned off and they wanted the detector to be armed at all times. Are you POSITIVE that the Detector was always killed by the battery disconnect. Doug