[Fulltiming]

Pretty sure that is your intrusion alarm. It didn't work on my coach when I bought it used but Newell got it working again. Someone had changed the location of several wires going into the relay circuit in the bay in front of the exterior door on mine. When armed, it sounds if the exterior door is opened or the door to the bay were the circuit and relays are located or if the panic switch in the bedroom is activated. It only operates the electric horn on mine even when the air horns are selected from the dash. Clint was correct in the location of the switches (interior and exterior) to arm the system based on my 1992 model also. Before mine was rewired by Newell, the relays would click when it was armed also but at least it didn't set of the alarm.