| Air Low Light [message #349005] |
Mon, 07 October 2019 09:02  |
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Samuel Ferguson
Messages: 107
Registered: September 2019
Location: Pittsfield, Illinois
Karma: 0
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Air compressor works fine on leveling system. Leveling system is working. Air Compressor shuts down at about 120 - 125 psi, but the "Low Air" light stays illuminated. Is there a sensor that needs replaced?
Samuel Ferguson
Samuel Ferguson
Summer Hill, Illinois
(West Central Illinois)
1976 GMC Palm Beach
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| Re: Air Low Light [message #349047 is a reply to message #349005] |
Mon, 07 October 2019 21:00  |
Rick Staples
Messages: 126
Registered: May 2014
Location: Johnstown, Colorado, USA
Karma: -1
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On Power Level system there should be a switch on the tank for the Low Air light. It has two terminals according to the schematic: a brown wire coming from the warning light, and a black one going to ground. A short to ground in the brown wire would of course turn on the light.
Years ago it was suggested to connect the light to the compressor to indicate when it was running. Good idea, but not how GM did it, at least on my '75. ('76 Power Level should be same.) Assuming you have stock Power Level system, I would 1) disconnect the black wire at the switch. If light goes off, you probably have a shorted/stuck switch. 2)Next, disconnect the brown wire at the switch. Light should go out. If not, you probably have a short to ground in the wiring from the light.
OTOH, if you have Electro Level system, this may not apply to you. According to the schematic, the '76 Electro Level doesn't even have a Low Air light, but I'm not familiar with that system, so I'll defer to Emery or others.
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: [GMCnet] Air Low Light [message #349052 is a reply to message #349047] |
Mon, 07 October 2019 21:57 |
Emery Stora
Messages: 959
Registered: January 2011
Karma: 4
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Rick is correct. The the 76 and 77 GMCs did not use a light to indicate when the compressor was running but if you look closely at the plastic covering to the lights in the tell-tale panel you can see a low air but there is no bulb behind it.
I ran a wire from my compressor and put in a bulb and found some push in terminals to connect the compressor to. Several years back I mailed an instruction sheet, a bulb and a terminal out to anyone that requested one from me. I probably sent out 75 or more. I found the bulbs in the dash panels of junkyard Volvos. You can just reach up under the dash and turn out the socket with the bulb. That socket will fill our tell-tale panel.
I got the terminal clips from some 15 or 20 conductor connectors in GM junkyard vehicles.
If I look around my workshop I might find some left over from the ones I mailed out.
Emery Stora
77 Kingsley
Frederick CO
> On Oct 7, 2019, at 8:01 PM, Richard H Staples via Gmclist wrote:
>
> On Power Level system there should be a switch on the tank for the Low Air light. It has two terminals according to the schematic: a brown wire
> coming from the warning light, and a black one going to ground. A short to ground in the brown wire would of course turn on the light.
>
> Years ago it was suggested to connect the light to the compressor to indicate when it was running. Good idea, but not how GM did it, at least on my
> '75. ('76 Power Level should be same.) Assuming you have stock Power Level system, I would 1) disconnect the black wire at the switch. If light goes
> off, you probably have a shorted/stuck switch. 2)Next, disconnect the brown wire at the switch. Light should go out. If not, you probably have a
> short to ground in the wiring from the light.
>
> OTOH, if you have Electro Level system, this may not apply to you. According to the schematic, the '76 Electro Level doesn't even have a Low Air
> light, but I'm not familiar with that system, so I'll defer to Emery or others.
>
> 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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> GMCnet mailing list
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| Re: [GMCnet] Air Low Light [message #349136 is a reply to message #349052] |
Thu, 10 October 2019 13:45 |
Shawn Bennear
Messages: 43
Registered: February 2007
Location: Edinburg, PA
Karma: -1
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Emery Stora wrote on Mon, 07 October 2019 22:57Rick is correct. The the 76 and 77 GMCs did not use a light to indicate when the compressor was running but if you look closely at the plastic covering to the lights in the tell-tale panel you can see a low air but there is no bulb behind it.
I ran a wire from my compressor and put in a bulb and found some push in terminals to connect the compressor to. Several years back I mailed an instruction sheet, a bulb and a terminal out to anyone that requested one from me. I probably sent out 75 or more. I found the bulbs in the dash panels of junkyard Volvos. You can just reach up under the dash and turn out the socket with the bulb. That socket will fill our tell-tale panel.
I got the terminal clips from some 15 or 20 conductor connectors in GM junkyard vehicles.
If I look around my workshop I might find some left over from the ones I mailed out.
Emery Stora
77 Kingsley
Frederick CO
Emery,
If you find that information, I'd like to do it as well. Always wondered why that light never came on in my 77...
http://www.gmcmotorhomeworld.com
1977 Palm Beach, 403 V8 w headers.
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| Re: [GMCnet] Air Low Light [message #349144 is a reply to message #349140] |
Thu, 10 October 2019 15:53 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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Senior Member |
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I replaced my low pressure sensor and added a Compressor on light. I just ran a wire from the compressor switch to an empty spot in my teltale lights, added a light and now I know when the comp is on.
I also added an AC compressor light, it's pretty nice I must say
________________________________
From: Gmclist on behalf of Ethan James via Gmclist
Sent: Thursday, October 10, 2019 2:49 PM
To: gmclist@list.gmcnet.org
Cc: Ethan James
Subject: Re: [GMCnet] Air Low Light
If your 76 is an early one like mine (#40 for 76) it still has the Power Level system. My low air switch failed and I replaced. Here is a picture of
the old one and the new replacement one. It should be located on the tank, mine was in the back and it's a little hard to reach back there to screw
the terminals in.
https://i.imgur.com/xsdjSZq.jpg
--
Ethan James
1976 Glenbrook "Rosie"
Roanoke, VA
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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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