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308 AC pressure switch & wires

Discussion in '308/328' started by firedude308QV, Jul 4, 2016.

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  1. firedude308QV

    firedude308QV Karting

    Nov 22, 2007
    116
    Tarpon Springs, FL
    Full Name:
    Bill Scott
    #1 firedude308QV, Jul 4, 2016
    Last edited by a moderator: Sep 7, 2017
    After many years without AC, I installed the Retroair AC compressor. After installing all of the various components, I ran into a wiring problem.

    I believe I have two AC pressure switches. One behind the brake master cylinder and one near the AC dryer. Please see photo.

    The one behind the brake master cylinder has three electrical connections (1,2, 3). The one near the AC dryer has two electrical connections.

    The wire feed has two wires (black & orange/black).

    Does anyone know how to wire the AC pressure switches?

    Any help would be much appreciated.
    Thanks
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  2. Ferraridoc

    Ferraridoc F1 World Champ
    Owner Silver Subscribed

    Jun 20, 2012
    17,220
    Gold Coast, Aust.
    Full Name:
    Patrick
    #2 Ferraridoc, Jul 4, 2016
    The one with the capillary tube that sits on the pedal box is high pressure cut-off (actually it measures temp, which is a function of pressure). The one that plugs straight in near the dryer is low pressure cut-off. They are wired in series - it's in your wiring diagram - but both are normally closed circuits, and go to open circuit when tripped. I removed mine completely and installed a trinary switch. Much neater.
     
  3. firedude308QV

    firedude308QV Karting

    Nov 22, 2007
    116
    Tarpon Springs, FL
    Full Name:
    Bill Scott
    #3 firedude308QV, Jul 4, 2016
    Thanks for the info. The high pressure switch has three electrical connectors. Do you recall where each wire attaches to? Also, how did you install the trinity switch?
     
  4. Ferraridoc

    Ferraridoc F1 World Champ
    Owner Silver Subscribed

    Jun 20, 2012
    17,220
    Gold Coast, Aust.
    Full Name:
    Patrick
    #4 Ferraridoc, Jul 4, 2016
    Don't recall the connections, but it'll be searchable. I removed the 4 way union and plugged the trinary switch directly into the spare port on the new receiver/dryer.
     
  5. firedude308QV

    firedude308QV Karting

    Nov 22, 2007
    116
    Tarpon Springs, FL
    Full Name:
    Bill Scott
    #5 firedude308QV, Jul 5, 2016
    Last edited by a moderator: Sep 7, 2017
    I was able to take a pic of the high pressure switch. As you can see, there are three spade connections on top of the pressure switch. The three spade connectors form a triangle.

    I have 1 orange/black wire and 1 black wire per the wiring diagram.

    Where does each wire attach to and why are there 3 connections for two wires?
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