Part Number for Relay for Air compressor

[shawn bennear]

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
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http://www.gmcmotorhomeworld.com

 

[Ken B]

Are you looking for the air pressure switch that turn the compressor on and off on an electro-level one single compressor system?
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Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

 

[Ken B]

> Are 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