Hi Tuga,
I reserached the alarm/light thing a little and it looks like all I have, or ever had, was the light. On my list is an item to add a little buzzer in parallel with the light.
Back to Matt - since I am not sure of his coach model year I didn't mention it, but I have two options to get air to the toilet/doors beyond normal coach air that would be lost with a dryer failure. There is the auxiliary 115vac air compressor which is check valve protected from the air supply, and then after that there is a 12vdc air compressor, also check valve protected. I have tested both systems and with no air in the main tanks I can use either aux or 12vdc and produce the air pressure to operate my toilets and doors. Russ
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