Tach wiring Q
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Tach wiring Q

  1. #1
    RBC
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    Default Tach wiring Q

    Had the stereo redone in my carrera and now my tach doesnt work. I found a wire on the back of the tach that is just hanging, I am assuming it is a ground wire. took a pic I dont know shht about wiring so its easier then trying to explain it. Its the black wire with the blue connector on the right.


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    Senior Member slotracer's Avatar
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    yep, thats your ground wire, slide it back on
    slot
    87 eliminator
    next boat ??????????????
    new owner of the redneck yacht club
    Stockton, ca.

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    RBC
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    Thanks got any idea's on where I should ground it to?

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    Senior Member slotracer's Avatar
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    follow the wire and find out where it goes. looks like its daisyed chained to you other wires. find out where the big black one goes. was it wired when you got it? looks like a purple wire for your hot, should be red.
    slot
    87 eliminator
    next boat ??????????????
    new owner of the redneck yacht club
    Stockton, ca.

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    RBC
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    The purple wire is the power wire and the gray one next to it goes to the coil, the 2 black wires going into the yellow connector are daisy chained to the grounds on all the other gauges, the big black wire with the blue connector is just hanging down and not connected to anything the wire is only about a 8" long

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    Senior Member slotracer's Avatar
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    Quote Originally Posted by RBC View Post
    The purple wire is the power wire and the gray one next to it goes to the coil, the 2 black wires going into the yellow connector are daisy chained to the grounds on all the other gauges, the big black wire with the blue connector is just hanging down and not connected to anything the wire is only about a 8" long
    is there a connector on the other end of the big black wire? do your other gauges work?
    slot
    87 eliminator
    next boat ??????????????
    new owner of the redneck yacht club
    Stockton, ca.

  9. #7
    RBC
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    Yea it has an ring style connector on the other end of it but nothing up under the console has that type of connector, and yes all the other gauges work...

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    Senior Member slotracer's Avatar
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    Quote Originally Posted by RBC View Post
    Yea it has an ring style connector on the other end of it but nothing up under the console has that type of connector, and yes all the other gauges work...
    http://www.laidbackboatersboard.com/...agram-t32.html

    if you look at the set-up the + should be gray. I have a different tach in my boat. not sure on the purple wire. what make tach?
    slot
    87 eliminator
    next boat ??????????????
    new owner of the redneck yacht club
    Stockton, ca.

  11. #9
    RBC
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    The boat is a 87 Carrera the gauges are VDO, never had a problem with it before. The purple wire is connected to the +, gray wire is connected to S, and the ground connector has a double prong on it with the 2 black wires that are chained to the other gauges and the bigger black on just hanging there..

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    Senior Member YumaJet's Avatar
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    Heres a VDO Tach

    http://static.summitracing.com/globa...o-333151_w.jpg

    Here are the instructions on how to install or in your case, connect it properly without grounding something out.

    http://static.summitracing.com/globa...1%20(52mm).pdf


    If could have been connected another guage. Get a test light and see if its a ground or if its hot. As much as I'd like to say its not a hot wire, I have seen a few different guages set up differently and with a different color choices. If you do it yourself, its always best to use the common, Red, Black and Green. My Autometer tachometer just had three wires.
    boatless....

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    Glendale Arizona Squirtcha?'s Avatar
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    Quote Originally Posted by slotracer View Post
    http://www.laidbackboatersboard.com/...agram-t32.html

    if you look at the set-up the + should be gray. I have a different tach in my boat. not sure on the purple wire. what make tach?
    Purple wire should be 12 volts when the key is in the run position and should feed from the key to all the gauges (probably daisy chained from one to the next etc.).

    Gray wire is the actual tach feed as stated above.

    Black is most likely a daisy chained ground also going to all gauges and eventually to either battery negative, or engine block for ground.

    All you need for the gauge to work are those three wires connected to their proper terminals.

    That would be a pretty typical wiring job.

    Looking at the picture the two wire terminals on the right (yellow and blue connectors) both have a ground symbol under them. Probably a common grounding point for easy daisy chaining.


    Last edited by Squirtcha?; 05-18-2010 at 04:22 PM.

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