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Ground Wire by the headunit??

Discussion in 'A3/S3 Forum (8L Chassis)' started by Paradox1, Jun 3, 2012.

  1. Paradox1
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    Paradox1 Active Member

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    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

    [​IMG]

    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?

    [​IMG]
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  2. Jay A3
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    Jay A3 come fly with me

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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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  3. vrbob
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    vrbob Thats no Moon, Thats a space station!

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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)
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  4. Paradox1
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    Paradox1 Active Member

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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
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  5. Lemon S3
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    Lemon S3 Alex

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    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.
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  6. vrbob
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    vrbob Thats no Moon, Thats a space station!

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    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.
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  7. Lemon S3
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    Lemon S3 Alex

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    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.
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  8. Lemon S3
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    Lemon S3 Alex

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    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.
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