Air pressure 1976 Palm Beach

[Sketch4u]

What should the psi be at for "Low Air" light to come and go out? 1976 Palm Beach...
--
Samuel Ferguson
Pittsfield, Illinois
(West Central Illinois)
1976 GMC Palm Beach (A newbie who will not allow this thing to kick my butt!!)

 

[6cuda61]

Samuel are you talking when you first put it into gear and the light comes on? Or other?
--
Rich Mondor,

Brockville, ON

77 Hughes 2600

 

[Sketch4u]

When the system is low, the Low Air is lit. After compressor kicks on and fills the system, should the Low Air light go out?
--
Samuel Ferguson
Pittsfield, Illinois
(West Central Illinois)
1976 GMC Palm Beach (A newbie who will not allow this thing to kick my butt!!)

 

[Ken B]

I think that light, in your case, is wired to the air pressure start switch. So it will be on any time the comoresser is running or if it fails to
start when the air switch is tripped. That switch off and on levels is adjustable. I have mine set at around 90 and 125 PSI.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

 

[Sketch4u]

Compressor is turning off when tank is full, but the Low Air light is staying on!
--
Samuel Ferguson
Pittsfield, Illinois
(West Central Illinois)
1976 GMC Palm Beach (A newbie who will not allow this thing to kick my butt!!)

 

[richard h staples]

Samuel,
The "Low Air" warning light is entirely separate from the compressor, compressor switch, and "set power level to travel" light and buzzer, at least
as GM did it. The "Low Air" light is not all that useful, as the switch controlling it is set rather low. The manual doesn't specify, but I'd guess
it's around 50 or 60 psi, which is too low to get my '75 Eleganza up to ride height.

Because of that, it was recommended many years ago (in the GMCMI newsletter IIRC) to wire the light to the compressor circuit as a "compressor
running" indicator, and that may have been done to your coach, but it's not original. I saw no need to do this as I can usually hear the compressor
when it's running.

If your light stays on after the compressor shuts off, and you have normal 100 - 120 psi pressure, you either have a bad warning light switch (on
the tank I think) or a short to ground in the wiring from the warning light to the switch.

HTH,
Rick Staples

--
Rick Staples, '75 Eleganza, Johnstown, CO

"Advice is a dangerous gift, even from the Wise to the Wise, and all paths may run ill." -Tolkien

 

[Matt Colie]

In the earlier coaches you don't need a "compressor running" indicator any more than you need a tach to tell you that they engine is running. A low
pressure indicator (like the kind with a separate switch and circuit as I have planned for a future small project) would be helpful as we one time
took a hit to the air system that left the compressors pumping its dear little heart out and still not making adequate pressure.

Matt
--
Matt & Mary Colie - '73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan
OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Twixt A2 and Detroit