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Volvo tach shows reading when engine is off

Discussion in 'Boat Electronics' started by Paul L, Jul 27, 2005.

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  1. Paul L

    Paul L Guest

    My tack now jumps to 2500 RPM when I turn the ignition on without the
    engine running. I checked the grounds and the wiring, all looks OK. How
    do I tell if the tach is bad or is it in the wiring? The input to the
    tach (gray) wire seems to have about 1.2 v on it when I turn the
    eignition on. Whne the engine starts the tach maxs out. Anyone know any
    tests I can make to narrow the problem done?

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