air suspension controller
Printed From: the12volt.com
Forum Name: Relays
Forum Discription: Relay Diagrams, SPDT Relays, SPST Relays, DPDT Relays, Latching Relays, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=131676
Printed Date: May 15, 2025 at 12:39 PM
Topic: air suspension controller
Posted By: nukefield13
Subject: air suspension controller
Date Posted: June 22, 2012 at 4:48 PM
Hello to all and I believe I've finally found a forum that can help me resolve my controller problem. I have a 4/6 drop on my GMC 1500 PU and the airbags keep the axle from hitting the frame. Using the ON side of the ignition, I have tried wiring 2 pressure switches in series using a relay to turn on the air compressor to inflate the bags to 60# and then turn off. Note: 1 pressure switch is set to 30# (low) and the other is set to 60# (high). The pressure switches are NC and when the pressure drops below the 60# the compressor restarts which makes the compressor overheat. I must need a second relay to by pass the 60# PS so that the pressure will drop to the 30# PS and then turn on the compressor.
Thanks in Advance and hoping for a solution..........
Replies:
Posted By: lurch228
Date Posted: November 04, 2012 at 3:43 AM
If the 60# is supposed to stop the pump at a max of 60# pump turn off. Then it needs to be wired so that when the pressure switch opens it breaks the pump feed.
Her's how to do it: 12v to 30 relay & 30# PS, 30# PS to 86 relay, 87 to pump & 60# PS, 60# PS to 86 relay, 85 ground.
When 30# ps closes it provides power to coil which energizes the 87(NO) to pump which feeds back to 60# PS then to coil to keep coil energized when 30# opens, and when 60# PS opens, pump shuts off until 30# closes again.
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