Re: Air Pressure
Reply #10 –
Hi Mark,
Your 2001 problem has some similarities to our 2002 coach. Our buzzer/alarm also wouldn't stop sounding one morning at Grand Canyon. Had to disconnect it. The OEM FT electrical pressure gauges read low one tank and high in the other. We did visual inspections of air bags at every stop to confirm we had travel mode. We also added the DOT brake test to our pre-flight checklist as a safety procedure. Recommend Chucks link:
Also search for this topic on the forum: "Blue Module" failure. Sorry I couldn't figure out how to copy the link here for you.
On our coach I did the following when we got home:
1. Swapped electrical connections at gauges. Result: The pressure readings swapped front to rear.
2. Purchased new pressure senders, installed at front/rear tank. Result: No improvement at the gauges.
3. Installed mechanical press gauges with a tee at each tank so I could keep electrical sensors installed for comparison. The mechanical gauge proved I had proper air in each tank and that fault was somewhere in the electrical gauge circuit. (I suspect the "Blue module")
4. Removed the electrical press sensors and installed a Dwyer Series A2 Pressure NC switch in the tee at each tank. Wired them into a new circuit with a diode for each press switch and a buzzer behind dash. Circuit draws power from ignition switch so it can only sound off when ignition is on. These are adjustable pressure switches. Before installation I set them at 60psi using a small air compressor.
Result: With ignition on buzzer sounds whenever air tanks drop below 60-61 psi.
I have left the FT OEM buzzer disconnected thus far. This means no turn signal chime or HWH audible warning. The turn signal indicator lights and HWH level light on dash still function. We still check air bag travel height in a walk around at every stop.
I would like to get back the turn signal sounds and HWH audible warning. Next project. In the meantime we know what our air pressure is. And the gauges read accurately with engine off. Helps me keep aware of any developing air leaks.
Safe travels, Michael