The voltage and amps you refer to are from the main electrical bus. You
could have a bad connection between the main bus and the attitude
indicator. If you hook up a volt meter to the terminals of the attitude
indicator, that should tell you whether you are getting the full
voltage under load.
Alternatively, if your panel-mount ammeter is a real ammeter, you
should be able to tell how much extra current the attitude indicator is
drawing, and compare that to the manufacturer's specifications. Or you
can hook up a digital multimeter in series with your battery and do the
same measurement.
--- Garry <garrys@tampabay.rr.com> wrote:
>
> Being VERY electrically challenged, I'm hoping some of my smarter
> Europa friends can help point me in the right direction to solve a
> recent problem. I have an R.C. Allen electric artificial horizon
> instrument which began to "tumble" several months ago. I returned it
> to the factory and they said it tested OK, but replaced the bearings
> anyway. I reinstalled it, but same thing happened. When I
> telephoned the factory they suggested that perhaps I wasn't getting
> full electrical power to the unit. I'm assuming by that they mean
> 13.2 volts (2.2 volts per battery cell, times 6 cells). The
> voltmeter in my panel reads 11.9 volts with radio, GPS and
> transponder turned on, and reads 12.1 volts when I turn off the
> radio, GPS, and transponder. My Ammeter reads
> 003.............whatever that means. Increasing my RPM from 4900 to
> 5200 increases the voltmeter reading by about .1 volt. Do I have a
> voltage problem? If so, why? I've been flying my trigear 914 for 6
> years without this !
> problem, and have not added any additional electrical equipment to
> the plane in the 6 years. My battery is 2 months old. Should I be
> looking at my alternator.........or my
> regulator/rectifier..........or what? Is there a way to turn up the
> juice (volts) going to my artificial horizon? How would I go about
> trouble shooting this problem? What fixes are most likely? If you
> respond, please remember the first 4 words in this email! Thanks in
> advance.
>
> Garry Stout
> 914 tri, 460 hours, 6 years flying
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Andrew Sarangan
http://www.sarangan.org
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