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  1. #1
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    Tach Not Working

    Started this OB up for the 1st time after OB mechanic got it running very nice.
    all my gauges work except my tach. I have confirmed their is power to the tach.
    I dont want to smoke my brand new tach just by connecting each empty wire on the OB.
    I would "assume" its one coming out of the ECM, but you know what happens when we ASSUME.

    How to proceed?

    1996 Merc 225hp carb'ed
    If you think this is fun, wait til next weekend!

  2. #2
    Join Date
    Sep 2001
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    Pekin, IL
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    Grey wire in harness is tach and it hooks to the rectifier or voltage regulator at the motor.

    Rock
    Team Junk

    No sparkling wiggles in here, only dump truck grinches.

    "Screamin Heathen"

  3. Thanks DEN thanked for this post
  4. #3
    Join Date
    Jun 2003
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    minocqua, wis
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    like rock said grey wire to rectifier ,when tach goes down test rectifier cause its probably toast

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  6. #4
    Join Date
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    i take it rectifier and voltage regulator are the same?
    I do know mechanic installed a new voltage regulator.
    Ill check this out...thank you!!
    If you think this is fun, wait til next weekend!

  7. #5
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    Would almost take it back, nothing should be left disconnected when you pay.

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  9. #6
    Join Date
    May 2011
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    Oklahoma City, Ok
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    Thank you guys!!!
    It was the grey wire. tach now working!
    If you think this is fun, wait til next weekend!

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