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why is my friends outboard not charging?

Its a 2005 75hp 4 stroke mercury,where would he begin to try to find the problem.And what would you suspect it may be.Thanks

Update:

Thanks Lima,for sharing your professional answer,he will try it next week.

1 Answer

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  • 1 decade ago
    Favorite Answer

    1.. Make sure all connections are clean and tight.

    2. If your volatge regulator has a fuse (some do, some don't), check this first.

    3. Test the regulator as follows, you will need an ohmmeter:

    Zero the meter.

    Connect negative lead to either yellow lead

    Connect positive to the thick red lead

    Scale Rx10

    Reading 100-400

    Reverse the above test.

    Scale Rx1

    Reading 40k to infiinity.

    SCR checks.

    Connect Negative to Yellow lead

    Connect Positive to Case ground.

    Scale Rx1k

    Reading 10k to infinity

    Tach circuit.

    Connect negative to ground case lead or case.

    Connect positive to gray lead.

    Scale Rx1k

    Reading 10k to 30k.

    4. If your regulator is OK, you have a faulty stator.

    I would guess that you have a faulty regulator, this is a common problem, especially if you run a lot of accessories such as stereos, fish finders, live well pumps, etc.

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