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Thread: Discharging Battery Indication

  1. #1

    Discharging Battery Indication

    I can't tell from your note whether you are a BAC member. There are dozens of entries and many thousands of words posted on BAC, which provide extensive detail on this and related problems. Just search on "check the voltage regulator" (without the quotes) for the best initial diagnostic overview. Then search on "alternator", and again in the MML Archives, for dozens of other posts and Q&As that address this. BTW, charging system problems will have absolutely nothing to do with how the engine sounds or runs; only with getting it started. Unless equipped with STC'd specialty aftermarket parts, and unlike your car, the aircraft engine's magneto ignition system is completely self-contained, and requires no external electrical supply.

    It is almost a certainty that your problem is not three successive bad regulators and alternators. If you have actually had both the original set and two replacement sets go bad, it has to be due to an unresolved core problem; either a fault or bad installation activities or sequence, that is generating successive failures. It sure sounds like you are dealing with someone who does not understand the system, or who does not know how to pursue basic diagnosis. As so often happens, they are doing parts-replacement diagnosis on your dollar. The excuse often given (for skipping thorough diagnostics) is that it is faster for them and saves you shop-time fees. That is only true when the failure is obvious and they are right the first time. Unlike something like a flat tire, they seldom are, on this type of problem.

    BAC exists, in part, to help members avoid this complete waste of money. If you are not yet a BAC member, you have probably already spent the equivalent of 20 years of annual BAC dues on this one still-unresolved problem. It pains me to see people continue to go thorough these unnecessary scenarios, when myself and others have put in so much time and effort to help people avoid them. The information on BAC is both permanent and very easily searched. Good luck with your current problem.

    ----- Original Message -----
    From: jm8995
    To: musketeermail@yahoogroups.com
    Sent: Sunday, July 03, 2005 12:03 PM
    Subject: [musketeermail] Discharging Battery Indication


    After a new alternator and regulator, the ammeter gauge shows a
    gradual but fairly rapid battery discharge. This is with all strobes
    and landing lights and radios on. After turning off all of these
    components a slight discharge still shows. Mechanic said there were
    no apparent shorts in the system.

    Airplane runs fine, sounds good. Just looking for help.

    BTW. The regulator and alternators were replaced twice with new
    components due to defects or some fault or another during this whole
    process.

    Regards

    [Non-text portions of this message have been removed]



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  2. #2

    Discharging Battery Indication

    First, I'll agree with Mike that your mech is "shotgunning" the
    problem at your expense.
    Second, don't trust the 30-50 year old ammeter in the airplane. A
    competent mechanic needs to use a good test meter and see what is
    really going on!
    Bob
    A&P, Aero Eng.
    --- In musketeermail@yahoogroups.com, "jm8995" <jm8995@y...> wrote:
    > After a new alternator and regulator, the ammeter gauge shows a
    > gradual but fairly rapid battery discharge. This is with all
    strobes
    > and landing lights and radios on. After turning off all of these
    > components a slight discharge still shows. Mechanic said there were
    > no apparent shorts in the system.
    >
    >
    > Airplane runs fine, sounds good. Just looking for help.
    >
    > BTW. The regulator and alternators were replaced twice with new
    > components due to defects or some fault or another during this whole
    > process.
    >
    > Regards




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

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