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  1. #1
    Paradox1's Avatar
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    Ground Wire by the headunit??

    Anyone know of which wire would be ground? im installing a boost gauge directly above the headunit but im not hot on electrics so thought id ask here.
    on the gauge there is 3 wire, Black,red and orange



    Ive been told i need to join the red and orange to the grey/blue on the headunit as its for the dimmer switch.
    But before i do that i wanted me make sure i doing everything right

    which of these wires are ground?


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  3. #2
    Jay A3's Avatar
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    How did you get on with this?
    Im not an electrician; i would hazard a guess at the brown wire but have you checked the user manual?
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    vrbob's Avatar
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    ground is usually either green or green and yellow

    so guessing on your boost gauge Red = Positive, Black = Neutral, Orange = Ground (no other choice left)
    Audi S3 8L BAM 225 2002 - Ming Blue : Silver Heated Leather, Armrest, RNS-E - Bose, Alloy Mirrors, 18" RSTT`s, Sunroof, Cruise, AutoDim Mirror & Usual S3 Extras.
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    Paradox1's Avatar
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    Thanks for the comments lads,had a look on Google in the meantime and it came up saying black goes to Brown, red goes to grey/blue and orange is redundant.will give it a try 2mz unless anyone has autogauge boost gauge already fitted
    Word!!!

    My A3/Martys Golf would smash that, and this guys £7000 GT9743 supercharged love machine.

  6. #5
    Lemon S3's Avatar
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    Quote Originally Posted by vrbob View Post
    ground is usually either green or green and yellow

    so guessing on your boost gauge Red = Positive, Black = Neutral, Orange = Ground (no other choice left)
    I don't think you're right, I would of said black is ground and orange is illumination which is why you need to connect that to the red wire as it needs power.
    1999 APY S3 Imola Yellow

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  7. #6
    vrbob's Avatar
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    Quote Originally Posted by Lemon S3 View Post
    I don't think you're right, I would of said black is ground and orange is illumination which is why you need to connect that to the red wire as it needs power.
    Am just going buy what standard wiring usually is like in a plug etc.

    Your suggestion could well be right though as i have never wired up a boost gauge before.
    Audi S3 8L BAM 225 2002 - Ming Blue : Silver Heated Leather, Armrest, RNS-E - Bose, Alloy Mirrors, 18" RSTT`s, Sunroof, Cruise, AutoDim Mirror & Usual S3 Extras.
    Mods : Badger 5 Stg 2 Custom Map, FMIC, 3" DP & 200 Cell Cat, 007P, Jetex Filter & 80mm TIP & Heatshield, Complete LED Kit, Gen VW Aero Wipers, Full Powerflex Kit, R32 RARB, AP Shocks & Springs, 15mm Front & 20mm Rear Spacers, BB Uprated Actuator,
    N249 Delete & Catch Can, AP TVR 4Pot Brakes & DS2500`s, Sachs Carbon/Kevlar Clutch

  8. #7
    Lemon S3's Avatar
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    Quote Originally Posted by Paradox1 View Post
    which of these wires are ground?

    Do you not have the manual for the head unit as that will normally tell you what wires are what?
    I would say the brown is the ground and red/whites are constant 12v and the yellow/red is ignition live.
    I personally would be using a multimeter to find out what's what so I get it right first time without shorting anything out.
    1999 APY S3 Imola Yellow

    PS3: Broady_11

  9. #8
    Lemon S3's Avatar
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    Quote Originally Posted by vrbob View Post
    Am just going buy what standard wiring usually is like in a plug etc.

    Your suggestion could well be right though as i have never wired up a boost gauge before.
    I thought you might of gone by house electrics when you said neutral, cars don't have neutral wires as i believe they are for AC current only.
    1999 APY S3 Imola Yellow

    PS3: Broady_11

 

 

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