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Thread: How to enable the stock shiftlight in your tach

  1. #1
    Join Date
    Sep 2003
    Location
    Santa Cruz, CA
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    696

    Arrow How to enable the stock shiftlight in your tach

    I have a 2003 Caterham with the std gauges. If you look closely, you will see that there is a big LED in the middle of the tach. Well guess what, that's a shift light. Unfortunatly, it is not really useable in its current form as it is always on! I designed a small circuit to invert it's behavior and now have a working shift light.

    FYI, the original thread is here: http://www.blatchat.com/t.asp?Id=89522

    Here is the schematic:

    Tom "ELV15" Jones
    http://PIErats.com

  2. #2
    Join Date
    Apr 2006
    Location
    LI, NY
    Posts
    178

    Default

    this will work from the 'stock' ecu or will this only be enable from an aftermarket ECU?
    2002 SV zetec/sierra; yellow over green

  3. #3
    Join Date
    Sep 2003
    Location
    Santa Cruz, CA
    Posts
    696

    Default stock ecu

    I'm not sure about it working with the "stock" ECU. All that it really needs is an ECU that has a grounding shift light control. I would be suprised if any of the stock ECU's had this functionality (does the focus have a shift light?). Also you would probably want a way to set the rpm at which it turned on.

    Sorry, I'm not too familiar with the stock ECUs out there...
    Tom "ELV15" Jones
    http://PIErats.com

  4. #4
    Join Date
    Sep 2003
    Location
    Pasadena, CA
    Posts
    2,130

    Question

    At least I can say the circuit would work with the Emerald just the same way. What I don't understand with it is that the voltage of the LED should be still about 4.8V when the transistor is turned fully on [12V * 1k / (1k + 1.5k)]. So it would never turn off, just get a little dim....or am I missing something ? But maybe there are more than one LED in series and the 4.8 V is not enough to turn on?

    Gert
    Last edited by slomove; September 28th, 2006 at 08:03 AM.

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