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wired up !! electric fan to fog lamp switch

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    wired up !! electric fan to fog lamp switch

    my car is a track rat, so i'm not sure if this mod might apply to daily drivers.
    car '87 325:
    i've decided on running no fan/fan clutch, just my auxiliary. of course, the fan does work, but never came on when temp rises. thought of chasing thermo switch/relay but relied on ingenuity instead. so i've figured a neat way to switch it on/off from dash. first off, i've previously removed the a/c condenser, so i fashioned some brackets so the aux fan now sits right up against the radiator. i had also removed my fogs (diving boards w/fogs, not too attractive) but left the wiring running to the bumper. i cut half the wiring from the removed old fog lamp, keeping the connector, and spliced it into the thermo-switch on the top-left side of the radiator. the fog lamp carries only two wires, so i spliced it in for the highspeed and as a push fan.. the other end i simply plugged into the wiring/connector for the fog lamp
    so using the factory switch for the fog lamp, i can turn the fan on and off. it even gives a green light on the dash, so i can see that the fan is turned on.

    my only dilemma so far, this only works with ignition on and low beam headlamps on. doesn't work with high beam or parking lamps only. i'm sure i will figure out how to run it to 'on ignition' and somehow bypass the headlamp interaction..

    i'm happy because i really suck @ wiring ..
    Last edited by Slick92GS-R; 10-24-2006, 10:35 PM.
    --Hayden--
    '87 325 coupe- Trak Rat
    '93 318is- 4cyl's of fury
    '92 Integra GS-R--yeah, its fast..
    www.G2IC.com


    #2
    Originally posted by Slick92GS-R View Post
    my only dilemma so far, this only works with ignition on and low beam headlamps on. doesn't work with high beam or parking lamps only. i'm sure i will figure out how to run it to 'on ignition' and somehow bypass the headlamp interaction..

    i'm happy because i really suck @ wiring ..
    I believe this is an easy obsticle to overcome. Just do a search for "independent fogs".

    -Erik

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      #3
      Grab your testlight, unplug your foglight switch. Turn on the headlights and see what wire powers up when you turn the headlights on...but make sure it isn't the dimmer wire.

      Run that wire either to switched (ign) power or constant if you want the fan on if the car is off.

      When I did this same mod, I used my own wiring (no factory plug at all on the fog switch) and ran 2 wires to the fan switch wirting on the radiator, bypassing all of the other wiring, plus using the stock fan relays.

      Luke

      Closing SOON!
      "LAST CHANCE FOR G.A.S." DEAL IS ON NOW

      Luke AT germanaudiospecialties DOT com or text 425-761-6450, or for quickest answers, call me at the shop 360-669-0398

      Thanks for 10 years of fun!

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