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Is my 75 hp Yamaha charging the battery ??

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  • Is my 75 hp Yamaha charging the battery ??

    I don't see any increase in battery voltage (using multi meter) with engine running. 12.4 v is all it shows.

    My guess is it is not charging, that it should read 13 v or more.

    Am I wrong ?

  • #2
    Re: Is my 75 hp Yamaha charging the battery ??

    13.5 to 14.7 would be correct at upper RPMs

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    • #3
      Re: Is my 75 hp Yamaha charging the battery ??

      Thanks; I thought so.

      Is there any simple testing to determine the problem ?

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      • #4
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        Re: Is my 75 hp Yamaha charging the battery ??

        According to my c40 manual you measure the peak voltage coming out of the lighting coil with a peak reading voltmeter or DVA adapter and regular meter with the regulator disconnected. Should read 9V cranking and 25 V @1500RPMs . Above spec replace regulator below spec replace lighting coil

        It would do you well to get a manual for your motor. It will give you all the specs for your motor and what and how to do all your repairs and maintainance

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