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  1. 05-29-2023, 07:50 PM #1
    Anickeson11
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    2010 Mercury Pro XS High Voltage

    I have a 2010 Mercury Pro XS 2 Stroke. Serial number 2B017938 and I’m running smart craft gauges and my battery is a 2 year old 31 series AGM ProGuide battery. Battery has been tested and is fine. I went out tonight and my initial 15 minute run no issues. On my way back, I kept throwing a high voltage alarm. I was monitoring as I was WOT and it would randomly shoot up to 17 Volts. I just replaced alternator less than a month ago. My first check tomorrow will be the fusible link. How to I tell if it’s blown? What else should I look at? Thanks.
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  2. EuropeanAM
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    #2 05-29-2023, 08:33 PM
    Will not be fusible link because you would get NO OUTPUT.

    A poor connection on a battery cable, battery switch, or a bad battery switch can cause this... but most commonly it's the alternator.

    OEM or Aftermarket alternator?


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 47 years (learn something new every day).
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  3. Anickeson11
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    #3 05-29-2023, 08:49 PM
    All connections are direct and clean and checked. It’s an aftermarket alternator. But I was having this issue with my OEM which what initially led me to change it out.
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  4. EuropeanAM
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    #4 05-29-2023, 08:50 PM
    Results still indicate alternator. Many of the aftermarkets just don't hold up to spinning at 16K RPM's.


    Dual Mercury Master Technician- for Mercury Outboards, Mercruiser and Mercury Racing at European Marine in Greenville, SC.
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  5. Anickeson11
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    #5 05-29-2023, 08:59 PM
    Copy. OEM it is. I will update once I find out.
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  6. SilverFox579
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    #6 05-30-2023, 07:34 AM
    If you still have the OEM alternator look into having it rebuilt.
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  7. 1ranger487vs
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    #7 05-30-2023, 09:16 PM
    Who rebuilds them. Or can you rebuild them yourself
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  8. JOE54
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    #8 05-31-2023, 07:36 AM
    no parts sold by MERC MARINE , contact reputable alternator shop
    .................................................. ...the scariest thing in life is the unknown ...................................
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  9. SilverFox579
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    #9 05-31-2023, 08:21 AM
    Quote Originally Posted by JOE54 View Post
    no parts sold by MERC MARINE , contact reputable alternator shop
    +1!
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