| Pressure switch [message #358828] |
Mon, 21 September 2020 12:28  |
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Samuel Ferguson
Messages: 107
Registered: September 2019
Location: Pittsfield, Illinois
Karma: 0
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What is the psi's for "idiot" low air light to come on and go off on a 76 Palm Beach. Just wanting to know low setting/ high setting.
Samuel Ferguson
Summer Hill, Illinois
(West Central Illinois)
1976 GMC Palm Beach
[Updated on: Mon, 21 September 2020 22:36] Report message to a moderator |
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| Re: Pressure switch [message #358830 is a reply to message #358828] |
Mon, 21 September 2020 14:08  |
Hal StClair
Messages: 971
Registered: March 2013
Location: Rio Rancho NM
Karma: -12
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If you are asking about the air, its just a timer.
Hal
"I enjoy talking to you. Your mind appeals to me. It resembles my own mind, except you happen to be insane."
1977 Royale 101348,
1977 Royale 101586, Diesel powered,
1974 Eagle Bus 45',w/slideout,
Rio Rancho, NM
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| Re: Pressure switch [message #358837 is a reply to message #358828] |
Mon, 21 September 2020 20:43 |
Rick Staples
Messages: 126
Registered: May 2014
Location: Johnstown, Colorado, USA
Karma: -1
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Too low a pressure to be really useful. Mine comes on around 70-80 psi, at which point the rear end is hanging from the shock absorbers, or almost. By that time you should know something's wrong anyways. Previous owner installed a pressure gauge which is what I follow. Some folks rewired the idiot light to come on whenever the compressor runs. If it stays on a lot, you know there's a leak or compressor problem.
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
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| Re: Pressure switch [message #358862 is a reply to message #358828] |
Tue, 22 September 2020 12:16 |
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RF_Burns
Messages: 2277
Registered: June 2008
Location: S. Ontario, Canada
Karma: 3
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Mine is a 1977 so it does not have the "Low Air" light.
I would first pull the wire off the existing pressure switch and see if the Low Air light goes out. If not, you have a short to ground on the wire to the pressure switch. If it does go out, then it is a faulty switch.
I would look for an inexpensive pressure switch that can handle pressures up to about 150PSI and is adjustable. Then adjust it to activate the light at a pressure just below where the compressor usually comes ON. In that way it will not come on during regular compressor cycling. But it will turn ON when the pressure is low at startup and if the compressor fails to come ON.
Just my farm-boy mechanic way of seeing things.
Bruce Hislop
ON Canada
77PB, 455 Dick P. rebuilt, DynamicEFI EBL EFI & ESC.
1 ton front end
http://www.gmcmhphotos.com/photos/showphoto.php?photo=29001
My Staff says I never listen to them, or something like that
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