| Part Number for Relay for Air compressor [message #336849] |
Sun, 09 September 2018 08:41  |
Shawn Bennear
Messages: 43
Registered: February 2007
Location: Edinburg, PA
Karma: -1
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I am suspecting the relay for the air compressor has bit the dust. I plan on hooking up the power wire to the house wiring as some have done. Just for some reason, it suddenly quit working. I took the power wire to the compressor and hooked it to the house power, ran fine... I am suspecting the relay. It looks like the high speed blower relay, but not sure.
Anyone have the part numbers for the relay?
Thanks!
Shawn
http://www.gmcmotorhomeworld.com
1977 Palm Beach, 403 V8 w headers.
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| Re: Part Number for Relay for Air compressor [message #336852 is a reply to message #336850] |
Sun, 09 September 2018 09:23  |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Ken Burton wrote on Sun, 09 September 2018 08:51Are you looking for the air pressure switch that turn the compressor on and off on an electro-level one single compressor system?
I have never worked in that area so after I made the above posting, I researched the wiring diagram for a 1977 GMC. It turns out that there is a relay and it's purpose it to shut off the compressor when the travel switch is in the hold position. If you want a temporary work around you could attach relay terminal position 1 and 3 together. If that fixes your problem, then you are probably correct that the relay is bad or the hold travel switch has a problem. If you install a test jumper in the relay use a heavy gauge jumper. That is a high current circuit. GM used 12 gauge wire when they designed it.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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