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Thread: Tach signal

  1. #1
    Senior Member Cam99's Avatar
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    Tach signal

    Were can I pick it up at. Negitive side of the coil and if so which wire is it (if memory serves I seem to remember a yellow wire and a green wire) or if not there , where.

  2. #2
    Senior Member coralcoupe1993's Avatar
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    Quote Originally Posted by Cam99 View Post
    Were can I pick it up at. Negitive side of the coil and if so which wire is it (if memory serves I seem to remember a yellow wire and a green wire) or if not there , where.
    Yes, test the coil to see which wire.....but I thought that coupe had an MSD???? If that is the case there is a tack output the ole red box.
    87 GT
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    67 Contiental 4 door
    06 Powerstroke

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    Just spank it!!! Viper_ed's Avatar
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    You can get it at one of those 2 wires Cam. I don't remember off hand which one it is, but it will be the only one that has a AC current, you know the stuff those furnaces & ac's you install use. :D

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    Senior Member Cam99's Avatar
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    Quote Originally Posted by Viper_ed View Post
    You can get it at one of those 2 wires Cam. I don't remember off hand which one it is, but it will be the only one that has a AC current, you know the stuff those furnaces & ac's you install use. :D


    DC current on the car

  5. #5
    Just spank it!!! Viper_ed's Avatar
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    Quote Originally Posted by Cam99 View Post
    DC current on the car
    Put your meter on it! Or better yet, grab it while the car is running and tell me if you still think it's DC.

    The tach signal wire on the car is the only wire that can actually shock you. It IS AC Current.

  6. #6
    Senior Member coralcoupe1993's Avatar
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    87 GT
    93 Notch
    60 Country Sedan
    Fairlanes/Galaxies 59-68
    67 Contiental 4 door
    06 Powerstroke

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    SCS Addict Stangman701's Avatar
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    Quote Originally Posted by Viper_ed View Post
    Put your meter on it! Or better yet, grab it while the car is running and tell me if you still think it's DC.

    The tach signal wire on the car is the only wire that can actually shock you. It IS AC Current.
    Not sure on the whole AC/DC thing, I would guess it's still DC though just with really high voltage. Ive been shocked by plug wires before too though. I was dumb and tried changing them around while the car was running and a couple of them shocked the shit outta me
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  8. #8
    Senior Member Cam99's Avatar
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    Quote Originally Posted by Viper_ed View Post
    Put your meter on it! Or better yet, grab it while the car is running and tell me if you still think it's DC.

    The tach signal wire on the car is the only wire that can actually shock you. It IS AC Current.
    I will check that out. I can't imagine why there would be a ton of amperage going through the feed wire of the coil, and it's only 12 V going in. It's the job of the coil to create the many thousands of volts that go through the plug wires. Interesting.

    EDIT: AC/DC rocks!

  9. #9
    Just spank it!!! Viper_ed's Avatar
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    Let's just say the 15+ years of Mobil Electronic Installations has been a good teacher on finding a tach signal. I'll never forget the 1st remote starter I put in and probing that wire and getting shocked by it!


    Oh yeah, I think Colin is drinking again on a Friday at work!

  10. #10
    Senior Member coralcoupe1993's Avatar
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    Quote Originally Posted by Viper_ed View Post


    Oh yeah, I think Colin is drinking again on a Friday at work!

    87 GT
    93 Notch
    60 Country Sedan
    Fairlanes/Galaxies 59-68
    67 Contiental 4 door
    06 Powerstroke

  11. #11
    Senior Member Cam99's Avatar
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    Low and behold I did measure about 7 volts A/C current on the yellow coil wire. (and about 5 amps). Learn something new every day. Ed you is teh shiznit

  12. #12
    Senior Member wick's Avatar
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    Oh, its definatly AC voltage.
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  13. #13
    Just spank it!!! Viper_ed's Avatar
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    Quote Originally Posted by Cam99 View Post
    Low and behold I did measure about 7 volts A/C current on the yellow coil wire. (and about 5 amps). Learn something new every day. Ed you is teh shiznit

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