single wire cooling fan switch
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  1. #1
    dek
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    single wire cooling fan switch

    how do you wire one of these up.

    i've only ever seen switches with 2 wires

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    Dragging not Bragging vince-305's Avatar
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    Well the only things ive ever known to only have a single wire (temp sender and oil pressure switch) both screw into the engine block thus working on the negative/earth side

    Where does your switch mount ?

    If its in the rad then is it metal or plastic ?
    Bit'z 'N' Piece's
    Ford consul mk2 chevy powered highrider

  4. #3
    dek
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    i have the temp sender for the gauge in the intake already.

    i was looking for a thermostatic switch to operate the fan but all i have found so far are single wire.

    it for a 302 3/8npt thread. will going in the stat housing

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    dek
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    http://www.speedwaymotors.com/Electr...nsor,2349.html

    like this.

    instructions are actually there as well.

    still dont understand how it works though

  7. #5
    My name is Martin 30psi's Avatar
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    It earths out the -ve wire coming off the fan, switching it on. Instead though set it up to earth out a relay and then wire the fan in to the relay. Simple really

    I use a Revotec adjustable controller than goes in line in the rad hose.

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    Official RnS Addict UK RUSS 1960 OLDS's Avatar
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    Quote Originally Posted by dek View Post
    how do you wire one of these up.

    i've only ever seen switches with 2 wires

    Hi dek,

    Not being able to see the switch you are refering to, this is purely guess work.

    I am guessing the switch you are refering to, is dependant on a certain level of heat to switch it on to create a circuit and has a metal housing which would be the earth (effectively the second wire).

    If this is the case you would run a live feed straight to the fan (preferably via a fuse for safety and maybe also via a relay depending on the amount of current to be drawn) run the other wire that comes off of the fan to your thermostat switch. When the thermostat switch gets up to tempreature it will earth out to the engine block creating the circuit.

    Please also note the amount of current the switch can handle before wiring up as this may also dictate the need for a relay to be installed in the circuit.

    Where possible i always try to use relays as this reduces the load on older/existing wiring plus also puts less load on the switches/switching devices.

    It is much easier to get/find relays than it is to replace say the head light switch on your 1960 Olds for example.

    The only downside to this is you need a bit more wireing but it is better than having something fail or your car burn to the ground.

    If you need any help, you can always give me a bell.

    Cheers.

    Russ. 07762 - 747643. 10.00 - 22.00

  9. #7
    dek
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    cheers guys.

    simple when explained

  10. #8
    Official RnS Addict UK RUSS 1960 OLDS's Avatar
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    Quote Originally Posted by dek View Post
    http://www.speedwaymotors.com/Electr...nsor,2349.html

    like this.

    instructions are actually there as well.

    still dont understand how it works though
    Hi dek,

    Just seen this post, must have gone up while i was typing mine.

    That switch will earth out through its body, so effectively the metal body is the second wire.

    I would definately wire that via a relay to be on the safe side if you need any help let me know.

    Cheers.

    Russ.

  11. #9
    dek
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    so i have a 30amp fused live to the relay .
    then the wire to the fan which will be live when the relay switches.

    earth from the fan.

    wire from thermostatic switch to relay.

    where does the other relay wire go .?

  12. #10
    My name is Martin 30psi's Avatar
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    The 30 amp live feed goes to both the +ve terminals on the relay (30 & 86)

    The 85 pin goes to the sensor. 87 then goes to the fan +ve terminal and then you earth out the fan -ve.

    Or you can do it so the relay is earthing out the fan by running the current though 30 and 87

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