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[GMCnet] Restoration. Late 78 two compressor air ride [message #295263]

Mon, 08 February 2016 23:55

BobDunahugh

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Registered: October 2010
Location: Cedar Rapids, IA

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Spent 3 hours removing PO custom 12v wiring. Then tried the compressors. Both run. ( THAT was a RELIEF.) But a few times I had the hit on/off a few times. Think I'll look up the relay numbers in the GMCMI parts book. Hopefully new relays will rectify the problem. Next need to check the ride hight switches tomorrow. Anyone up on these compressors? And what were they used in.Bob Dunahugh78 Royale
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Re: [GMCnet] Restoration. Late 78 two compressor air ride [message #295266 is a reply to message #295263]

Tue, 09 February 2016 07:10

bdub

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Registered: February 2004
Location: Central Texas

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http://www.gmcmhphotos.com/photos/g4607-electronic-height-sensors.html

http://www.gmcmi.com/wp-content/uploads/2014/05/ElectroLevel-II-Presentation.pdf

bdub

-----Original Message-----
From: Gmclist On Behalf Of Bob Dunahugh
Sent: Monday, February 8, 2016 11:55 PM

Spent 3 hours removing PO custom 12v wiring. Then tried the compressors. Both run. ( THAT was a RELIEF.) But a few times I had the
hit on/off a few times. Think I'll look up the relay numbers in the GMCMI parts book. Hopefully new relays will rectify the
problem. Next need to check the ride hight switches tomorrow. Anyone up on these compressors? And what were they used in.Bob
Dunahugh78 Royale

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bdub
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Re: [GMCnet] Restoration. Late 78 two compressor air ride [message #295569 is a reply to message #295263]

Mon, 15 February 2016 15:43

Bob de Kruyff

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Registered: January 2004
Location: Chandler, AZ

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BobDunahugh wrote on Mon, 08 February 2016 22:55

Spent 3 hours removing PO custom 12v wiring. Then tried the compressors. Both run. ( THAT was a RELIEF.) But a few times I had the hit on/off a few times. Think I'll look up the relay numbers in the GMCMI parts book. Hopefully new relays will rectify the problem. Next need to check the ride hight switches tomorrow. Anyone up on these compressors? And what were they used in.Bob Dunahugh78 Royale
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Bob--I'm not aware of any relays in that system. The compressors have an internal solenoid that functions as an exhaust valve when the ride sensor wants to lower the coach. Then there is an external solenoid valve that functions as a hold valve to basically block off the airbags. The compressors were used in millions of GM vehicles in conjunction with airshocks to provide self leveling. They were last used in the GM minivans.

Bob de Kruyff
78 Eleganza
Chandler, AZ

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