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Thread: Still no luck

  1. #1

    Still no luck

    I have written about my discharging battery problems. This mechanic
    has gone through three alternators and two voltage regulators. Now,
    He is sending the original out for a re build.

    I can not find any information in the archives and downloads on this
    topic. Can someone please help. It has been nearly two months and I
    have not flown the plane yet.




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  2. #2

    Still no luck

    >I have written about my discharging battery problems. This mechanic
    >has gone through three alternators and two voltage regulators. Now,
    >He is sending the original out for a re build.
    >
    >I can not find any information in the archives and downloads on this
    >topic. Can someone please help. It has been nearly two months and I
    >have not flown the plane yet.

    Let's start with a "Mechanic-ectomy" so that you can get someone that
    actually understands charging systems. Throwing parts at the problem is
    obviously not working for him THIS time.

    There are a few basic measurements that must be made, and with that
    information the right part can be installed (if any parts are actually needed).

    The fact that he's wasted more than $1000 of your money on 3 alternators
    ($330 each) and 2 regulators ($115 each) and STILL has no clue what's
    wrong, ought to be reason enough for you to dump this loser and ferry the
    plane to someone that CAN fix it.

    I think that Mike Rellihan has already advised you to check the BAC
    archives, since Yahoo messed up the search function a long time ago, and
    you can not effectively search the MM archives for older topics.

    What one MUST know, before even starting the engine:

    Battery voltage = 12.6V fully charged
    Verify voltage TO the VR on the "S" terminal = within 1 volt of battery voltage
    Verify voltage FROM the VT on the "F" terminal = 6-10 Volts
    Measure resistance from wire removed from F terminal to ground ~4-10 ohms

    After this is known, then you can see if the VR has power and is exciting
    the alternator. If there is no power TO the VR, then its a fuse/CB/wiring
    issue and you trace the wires according to the factory maintenance manual
    wiring diagram.

    If there is power FROM the VR and there is NOT an open or shorted circuit
    on the wire taken off the F terminal and measured to ground, then the Field
    windings in the alternator are probably OK, as is the wire TO the alternator.

    At this point, you start it up, and measure the system voltage. If not
    13.8-14.2V, then you now troubleshoot why the alternator is off line or
    putting out too little voltage. If you did your homework in the above
    paragraphs, then you probably ALREADY found the problem.

    If you can't seem to get the alternator to charge the battery, the step
    BEFORE buying an expensive $300 "aircraft" rebuilt unit is to take the old
    one to AutoZone or Pep Boys and have them spin it up for free. Tell them
    its a 71 Ford P/U with AC, and they can test it just fine. (Actual
    application for the Ford DOFF-10300J alternator found on most Sundowners
    and other 70's Musketeers.) According to Kelly Aerospace, 80% of the
    "core" alternators returned for OH are just fine.

    Personal consultation is available off list. But I'd start by finding a
    REAL mechanic, and ditch this one that fell asleep in class the day they
    discussed charging systems.

    Bob Steward, A&P IA
    Birmingham, AL



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  3. #3

    Still no luck

    --- In musketeermail@yahoogroups.com, "jm8995" <jm8995@y...> wrote:
    > I have written about my discharging battery problems. This
    mechanic
    > has gone through three alternators and two voltage regulators.
    Now,
    > He is sending the original out for a re build.
    >
    > I can not find any information in the archives and downloads on
    this
    > topic. Can someone please help. It has been nearly two months and
    I
    > have not flown the plane yet.

    Another thing to look at is the battery and its connections. A
    battery may not be charging up fully because it getting week. Its a
    good idea to replace the battery every 3 years, some people recommend
    every two years if you dont fly often.
    Rick Cantrell




    Join BAC today and be a part of the ONLY Type Club for the Musketeer series!

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  4. #4

    Still no luck

    Don't forget to check the water level in the battery.
    You may have a cell that is empty?

    Jay

    --- Rick Cantrell <jrcantrell@knology.net> wrote:

    > --- In musketeermail@yahoogroups.com, "jm8995"
    > <jm8995@y...> wrote:
    > > I have written about my discharging battery
    > problems. This
    > mechanic
    > > has gone through three alternators and two voltage
    > regulators.
    > Now,
    > > He is sending the original out for a re build.
    > >
    > > I can not find any information in the archives and
    > downloads on
    > this
    > > topic. Can someone please help. It has been
    > nearly two months and
    > I
    > > have not flown the plane yet.
    >
    > Another thing to look at is the battery and its
    > connections. A
    > battery may not be charging up fully because it
    > getting week. Its a
    > good idea to replace the battery every 3 years, some
    > people recommend
    > every two years if you dont fly often.
    > Rick Cantrell
    >
    >
    >


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