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Yamaha Tachometer Erratic

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  • Yamaha Tachometer Erratic

    The Yamaha Digital Tach on my 2001 F-115TLRZ started to read erratic this afternoon. The tach will jump high in RPM by 20%-50% every 5 or 6 seconds and then return to normal. No change in load or motor revs accompanies the change on rpm reading. This is ocurring at all engine speeds. I checked the connections under the dash and have not found anything which could explain what is going on. Looking for troubleshooting suggestions.

  • #2
    That is probably a bad tach, try a new tach.
    Regards
    Boats.net
    Yamaha Outboard Parts

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    • #3
      Any way to tell its a bad tach before spending $350 on a new tach?

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      • #4
        You can connect a AC voltmeter to green wire at tach to see if signal voltage stays steady.
        Regards
        Boats.net
        Yamaha Outboard Parts

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