Rev counter (aum swap)

Discussion in 'Electrical' started by v8rumble, Jan 24, 2021.

  1. v8rumble Paid Member Paid Member

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    Hi yet another electrical gremlin (CE1).

    I have wired in a converter from Dreadnought Customs as per the instructions.

    red/black to D26
    green/brown to ecu feed
    black to ignition live
    brown to earth.

    The rev counter does not work although when I turn the ignition on and off the needles twitches.

    Is there any way of testing the rev counter as it is a second hand unit as the car was poverty spec 1.3

    [​IMG]
     
  2. v8rumble Paid Member Paid Member

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    I have checked and I have continuity between D26 and the instrument panel.

    How can I bench test the rev counter?
     
  3. NateS2

    NateS2 Paid Member Paid Member

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    The twitching is normal, if it twitches then generally that means its working. No idea if this is related but I refurbish instruments and I had a huge issue getting my DIY tacho convert to work. Ended up being a combination of wire thickness/length which was quenching the "spikes" and stopping the tachs working.
     
  4. Mk2daz Forum Member

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    Location:
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    I had similar issues with my tacho converter from Emerald, turned out the earth to my clocks plug RHS (rev counter side i think iirc, mk2 scirocco clocks) was poor
     
  5. v8rumble Paid Member Paid Member

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    Thanks for the replies I will check the earth first as it is easy.

    How would I go about checking if the wire thickness/lengths is quenching the signal and on which wires?
     
  6. v8rumble Paid Member Paid Member

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    Just an update on this.

    Stripped everything back to check it all and found a pretty random fault.

    There was no live supply to the gizmo for the following reason:

    The cable I chose to connect it with has a double insulation on it (see pic), so when I crimped a bullet on the end unbeknown to me I had crimped the secondary insulation not the wire strands. Bear in mind I was in a dimly lit interior so as the insulation is brown I didn't spot it but hey ho.

    Needless to say I will not get caught like this again (honest lol).

    Hope this may be of help to someone else one day.




    One more word DOOOHHHHHH!!!!!!!


    wire.jpg
     
  7. Savagesam

    Savagesam Moderator Staff Member Moderator

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    Ah well, at least it was a nice easy fix :)
     

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