The low air light on the dash has come on. Both air tanks read 115# and the warning horn is off. Air system appears to be normal. Any ideas?

Since both tank gauges are reading 115 and the warning horn is off, I'd agree with Seth and 'guess' the Low-Air light sensor is bad (but then I haven't stayed at a Holiday Inn Express lately).

But something that definitely needs to be looked-at, just to make sure (if nothing else than to have the sensor replaced).

I would make sure that one of the tank drain valves didn't get knocked open and then drain the air completely out and then air ir back up.

Sometimes it's like a lot of electronics, it just needs to be reset. If that doesn't do it then you need to hunt down the sensor for the light. It's weird, but I would think the alarm and light would be on the same sensor.

Update: I drained both air tanks and turned the chassis battery switch off then back on and started the engine, and walla, no light. Life is good again! FWIW the engine and generator started without being plugged in at 13 degrees this morning. Florida is really looking good next week.

Chuck