Russgh Posted September 2, 2021 Share Posted September 2, 2021 Hi Monacoers, I am new to the group. I am having trouble with the low air alarm. I discovered the buzzer connector disconnected and reconnected it. It operates normally, beeper & low air light is on until the air pressure reaches around 70 psi. After reaching 120 psi, when I put the transmission in gear, the beeper comes on but not the low air light. The beeper sound is different than the low air sound. I suspected the sending unit on the front air tank however disconnecting the sending unit does not stop the alarm when the transmission is in gear. I removed the relay marked Bell-1 in the Monaco 2 box in the left front bay cabinet and everything works as it should i.e. beeper and light on when pressure is below 70 psi, goes off above 70 psi. The beeper and light do not come on when the transmission is in gear. What else does the Bell-1 relay do? could it disable other alarms. What does the sending unit do on the front air tank, disconnecting it had no effect that I could see? See photos below. IMG 2122 is the sending unit on the tank. IMG 2125 is the relay that goes in the box on the right of it. Any help or wiring diagrams would be greatly appreciated. -- IMG_2126 (2).zip Link to comment Share on other sites More sharing options...
Wrayj1 Posted September 2, 2021 Share Posted September 2, 2021 Russ, I had that issue in 2018 ended up replacing the hydraulic tank and float valve. After 11 years the tank had a minute leak , but the foam float valve also became saturated with hydraulic fluid causing it to drop into the fluid , which the alarm sensed as being low on fluid. No problem since replacing the tank and valve. Link to comment Share on other sites More sharing options...
Guest Ray Davis Posted September 2, 2021 Share Posted September 2, 2021 Mine will sound if I don't push in the parking brake button. Link to comment Share on other sites More sharing options...
Rick A Posted September 3, 2021 Share Posted September 3, 2021 May I impose on this discussion without distracting attention from the primary question. I know that the experts can answer this off the top of their heads. What should the max air pressure be? My pressure guage gets to a high of around 140 at start up and when it recharges on a trip it gets to around 130. Is this acceptable? Link to comment Share on other sites More sharing options...
Wrayj1 Posted September 3, 2021 Share Posted September 3, 2021 Rick, mine pretty much tops out at 120 and drop a little when braking. Link to comment Share on other sites More sharing options...
Ivan K Posted September 3, 2021 Share Posted September 3, 2021 2 hours ago, Rick A said: May I impose on this discussion without distracting attention from the primary question. I know that the experts can answer this off the top of their heads. What should the max air pressure be? My pressure guage gets to a high of around 140 at start up and when it recharges on a trip it gets to around 130. Is this acceptable? It probably should have been a new topic but a quick answer is that you should have somewhere around 120-125 psi cutoff, normally. Safety valve opens at 150. There is an adjustable air governor to get it down if you so decide. Depending which make you have, there are adjustments described at number of places on the net. If you search for air governor, you might recognize the one you have. 1 Link to comment Share on other sites More sharing options...
Fonman Posted September 3, 2021 Share Posted September 3, 2021 If you get different readings the governor is starting to stick. A new one is less than $20 at NAPA if you can change it yourself before you get stuck somewhere. End Hijack! Link to comment Share on other sites More sharing options...
jacwjames Posted September 3, 2021 Share Posted September 3, 2021 I looked at my chassis wiring diagram and my Bell comes on for low air and park brake but also must be able to sense neutral from the VIM Link to comment Share on other sites More sharing options...
Fonman Posted September 3, 2021 Share Posted September 3, 2021 First my disclaimer. I am not familiar with your coach. A bunch of things can trip a buzzer. Low oil pressure, (should sound whether in gear or not) low coolant, antenna up, slide out, maybe jacks not fully up. Typically you would have an idiot light or other indication to tell you what it is complaining about. Since the air buzzer goes off and it buzzes when put in gear, I would be looking for something besides air pressure. Parking brake alarm should give a visual. Easy to test that one. Link to comment Share on other sites More sharing options...
Russgh Posted September 3, 2021 Author Share Posted September 3, 2021 Thanks to everyone for the great replies. Jim J. is your wiring diagram sharable? I am willing to pay for reproduction costs. Link to comment Share on other sites More sharing options...
jacwjames Posted September 3, 2021 Share Posted September 3, 2021 Here is the diagram, i thought it was in the downloads section but didn't see it. It is a PDF file. When you open it and zoom in it will be blurry, hit CTRL5 and it will clear right up. You can do a word search and it will take you through all the hits, once you figure out the right word(s) it makes it easy to follow. If you find a specific area you want to keep you can do a print screen and save it too your files. Alternator connections is a good example. 2002 Chassis Wiring Diagram 1.pdf Link to comment Share on other sites More sharing options...
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