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Thread: bought mk2 coil was replaced and tach wire has no plug in

  1. Semi-n00b
    Join Date
    Mar 7th, 2012
    Location
    angels camp ca
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    13
    Vehicles
    1992 cabriolet karmann
    04-25-2012 08:01 PM #1
    its a 1992 cabi 8v 1.8. the coil was replaced there is no plug in for the tach and its not working. is there a wire to tie into?

    thanks

  2. Semi-n00b
    Join Date
    Mar 7th, 2012
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    angels camp ca
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    1992 cabriolet karmann
    04-25-2012 10:59 PM #2
    it has one black one black and green and one brown being the ground please help

  3. Member
    Join Date
    Aug 14th, 2005
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    Germany
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    04-26-2012 03:54 AM #3
    Would have to look up wiring for a Cabby as I never owned one, but most Volkswagens do not get the tachometer signal off the coil. Yours I believe would be a Digifant II setup and the EUC would provide the signal. It would I guess go from a pin on the engine harness from the ECU to a connector in the area of the ECU, then through the fire wall into the relay panel abd back out into the instrument cluster. There are plenty of places where the contact could get broken so a wiring diagram would be best to use.

  4. Member
    Join Date
    Nov 17th, 2001
    Location
    Northern Wisconsin
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    1,801
    04-26-2012 10:01 PM #4
    Noting that you are in California which would perhaps mean Digifant I -- the ignition coil nas a power stage (ie. special coil) which has a black wire at terminal 3/3 a green and black wire at Terminal 3/2 and a brown wire at terminal 3/1. There should also be a red and black wire at Terminal 1 on the coil. My thought would be that the red and black wire transmits a signal to the tach as that is the usual source of the tach signal. The wiring diagram that I have shows a computerized "tach control unit" in the cluster.

    All that being said -- make sure that you have the correct coil (with the power stage) if you have a California (Digi I car.) FR

  5. Semi-n00b
    Join Date
    Mar 7th, 2012
    Location
    angels camp ca
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    13
    Vehicles
    1992 cabriolet karmann
    04-27-2012 02:46 AM #5
    it raind today no garage


    ill give it a whirl tomorrow i got my hanes wiring diagram

    thank you for your help ill post my results

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