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Thread: Sierra voltage funk.

  1. #1

    Sierra voltage funk.

    I am having trouble with my B24 Sierra's voltage. Battery only one
    year old. When flying last night the dash lights dim on gear
    retract. On short final with power pulled, gear down, landing light
    on, dash lights almost too dim to read! During taxi with lights on,
    voltmeter reading slightly negative, which I would exect at idle rpm.
    Once to the ramp the problem the problem was inconsistent. Does this
    sound like alternator or regulator. The battery had been drained of
    power by the avionics shop a couple of times...required a jump. Any
    help would be gratly appreciated.

    David Crouch
    N22PH





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  2. #2

    Sierra voltage funk.

    David,

    I went through something like this ,although mine was
    more around draining when the a/c was not flown for 2
    weeks. Two new batteries later it seems to be better.
    Do you have some stuff that is live when you park the
    a/c? digital clocks etc etc?? You may want to check
    that out.
    I also swapped out the voltage regulator, always a
    good thing to try because your old version is 30 years
    old.
    Did you check the actual voltage that the system has
    to charge and drive the electronics during flight??
    You have about 60 Amps max which can be sucked up
    pretty quickly especially flying at night with all
    avionics on full blast. If you have a GPS, they
    typically have a BUS VOLTAGE reading. I know my King
    KLN 89B has one. Use that to reference you a/c voltage
    reader. Buy a cheap voltage meter that you can plug
    in the cigarette recepticle and see what that says if
    you do not have an alternative voltage meter in the
    a/c. I bet that you will not generate sufficient APs
    below 1200- 1500 revs. So with a long descend and hold
    etc with lights and landing lights on, you may be
    consuming lots of battery power that is not being
    replaced.
    Replace strobes with LED's and the new tail white
    strobe ( 650 bucks or so - ouch!!!) will reduce your
    consumption and looks good too
    HarryR
    B24R 1975
    --- petsurgery <petsurgery@yahoo.com> wrote:

    > I am having trouble with my B24 Sierra's voltage.
    > Battery only one
    > year old. When flying last night the dash lights
    > dim on gear
    > retract. On short final with power pulled, gear
    > down, landing light
    > on, dash lights almost too dim to read! During taxi
    > with lights on,
    > voltmeter reading slightly negative, which I would
    > exect at idle rpm.
    > Once to the ramp the problem the problem was
    > inconsistent. Does this
    > sound like alternator or regulator. The battery had
    > been drained of
    > power by the avionics shop a couple of
    > times...required a jump. Any
    > help would be gratly appreciated.
    >
    > David Crouch
    > N22PH
    >
    >
    >
    >




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