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  1. #1
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    Stator problems?

    Don I have a mercury 50 hp 2 stroke #1b745769. First the tach quit working. So I checked the yellow wires coming out of the stator. The bullet connectors are black on top of the motor where they come out of the stator and they are black where they hook up to the voltage regulator. Plus one of the red wires coming out of the voltage regulator is black at the bullet connector. The white and green wires coming out of the stator are alittle brown at the bullet connectors. When I check the battery I get 12.5v. When I check it with the motor running I get 12.5v. Then I checked the two yellow wires coming out of the stator looking for a reading of .16 to .19. The meter was all over the place. I am getting spark on all the plugs. Is this telling me my stator is toast? I assume the voltage regulator is gone. Hope this makes sense. Thanks for the help.

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  3. Mercury - 3 Liter Moderator EuropeanAM's Avatar
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    #2
    You'll need to turn the "Auto Range" feature OFF on your meter to test output voltage from the stator (to the regulator).

    Regulator is definitely going to need replaced, as well as ANY damaged, blackened, burnt bullet connectors.

    Also a good idea to pull the flywheel for a VISUAL inspection of the stator. Darkened or melted windings, or burnt-spots are an indication that you need to replace the stator (regardless of test results).

    NOTE: Load test battery to confirm it's condition, and CLEAN all battery cable connections. Engine cable installed FIRST, remaining lugs largest to smallest, and finish off connection with a Stainless Locknut (do not use Wing Nuts).


    Dual Mercury Master Technician- for Mercury Outboards, Racing & Mercruiser Sterndrives in Greenville, SC.
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  4. Member
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    #3
    Ok. I will pull the flywheel when I get home. The two yellow wires coming from the stator where all melted together. The motor will fire right up and runs fine. Let you now what I see under the flywheel. Thanks.

  5. Mercury - 3 Liter Moderator EuropeanAM's Avatar
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    #4
    You'll probably end up replacing that stator anyway.... so removal of the flywheel won't really be any waste of time.


    Dual Mercury Master Technician- for Mercury Outboards, Racing & Mercruiser Sterndrives in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 38 years (learn something new every day).
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  6. Member
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    #5
    Ok. It took me longer then I thought to get back to it. I have everything replaced and put back together. Don does it matter the way the yellow wires are hooked to each other. Could they be hooked up backwards?. Any ideas why my stator would have melted down? It was only 3 yrs old. I am waiting to turn the key to see if I hooked the yellow wires up right. Thanks.

  7. Mercury - 3 Liter Moderator EuropeanAM's Avatar
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    #6
    The yellow wires from the stator simply connect (not polarity sensitive... it's an AC circuit).

    Most commonly, stator failure in this circuit is a result of overcharging, due to a weak, or poorly connected CRANKING battery.

    Battery connections must be CLEAN, engine cable installed FIRST, remaining lugs largest to smallest, and finish off connections with a Stainless Locknut (do NOT use wing-nuts).


    Dual Mercury Master Technician- for Mercury Outboards, Racing & Mercruiser Sterndrives in Greenville, SC.
    Still consider myself a "Marine Apprentice" after 38 years (learn something new every day).
    Mercury Parts, Mercury Outboards, Smartcraft & Accessories, Injector Service, TDR Reeds- BBC Sponsor