Constant low air alarm - sensor or wiring issue?

[dbsoundman]

My low air alarm (circle with 3 arrows pointing at it) and the associated buzzer sounds continuously, even when the air pressure is great and totally normal (100-120psi). I know my air dryer leaks, but when the engine is running the pressure stays up just fine. I’m replacing the dryer as soon as I get one more part I need, but I was curious if anyone had further troubleshooting ideas to fix the alarm or find out why it may be going off.

[dbsoundman]

Just an update on this for posterity, turns out the air pressure sensors that trigger the warning light/buzzer were bad. These operate separately from the air pressure gauge which is mechanical, so when in doubt trust the air pressure gauge first, the rest is just for electronic idiot lights.

[Tejon7]

I just had one of those go bad. I bought a single replacement on Amazon, but 5 showed up at my door. If you (or anybody else) still need one, let me know. I doubt there are too many different varieties.