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Old 06-10-2014, 05:03 PM   #1
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Low Air Pressure Alarm

My low air pressure alarm is going off, the gauges are bouncing to 0 and back up. This seems to happen when its raining or my ac is dripping water. I have changed the filter, drained the tanks several times daily. On a recient trip I stopped using the dash air, ran the roof ac, and the problem stopped. Before I could see water dripping down up front. I have a 2007 Sportscoach Crosscountry MH on a Freightliner chassie. I think my problem is electrical.
Can someone give me direction on which electrical connections I should clean. I am cleaning connection with contach cleaner and applying die electric grease. Where are the sending units for the gauges? Any help will be greatly appreciated.

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Old 06-10-2014, 05:06 PM   #2
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Look outside where the dash A/C drains the condensation. Might be hitting something there.

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Old 06-10-2014, 05:26 PM   #3
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I had a similar problem on a 2008 Tiffin Allegro Bus. Every time it rained, I had it, but never long enough to troubleshoot. Tried sealing plugs, etc., with no help. We had no problem with the air system itself, only the gauges and low air buzzer.

The gauges and buzzer get their signals off a single wire that the MMDC sends as a multiplexed signal along the wire. The gauge knows what signal it's looking for and pulls the appropriate data out of the data stream and shows it as a gauge reading. If you look at the back of the dash, you'll see all the gauges are daisey chained, one to the next. I solved my problem by pulling all the wires off the rear of the dash gauges, scrambled all the connections and put them back in the new order. It worked, and I never had a problem again. I don't know why the rain effected the problem, but it never happened again. Go figure???
2013 Tiffin Allegro Bus 43QGP
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Old 06-10-2014, 09:22 PM   #4
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i all so have a 2006/5 Sportscoach Crosscountry MH on a Freightliner chassie

under the drive seat in the out side bay there is a small ECM black box 10x10inc or so with air lines going in to it

this runs most of every thing on the dash cluster .. and they like to go bad

may want to look there at the wiring and see if every thing is ok

i pulled and trash mine .. and move back to old school censers .. but thats not some thing you want to doo tho
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