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1. 06:37 PM - Re: Rotax 912 Charging Problem (bnelson79)
2. 06:39 PM - Rotax 912 Battery Discharging Problem (bnelson79)
Message 1
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| Subject: | Re: Rotax 912 Charging Problem |
I am having a similar problem to the one Hugh McKay had a few years ago. My problem
though is simply that the battery is not being charged. The voltmeter show
12 volts at startup and slowly drains down from there (faster if I turn accessories
on). Noticed this while flying yesterday when the voltmeter was pegged
on the high end. Landed and suddenly started getting a lot of static in headset.
Turned off heater and static disappeared, but voltmeter dropped to zero.
Noticed landing light had been accidentally turned on - turned off and volt
needle swung to high side again. As I turned switches off the needle would
swing from high to low. Finally shut down. But when I tried to restart volt
meter read only around 9 volts and engine wouldn't turn over at all. Recharged
battery today and engine started with 12 volts showing and none of the other
switching problems. But juice continued to dribble away.
Any suggestions??? Bad ground??? Bad regulator???
Bill Nelson
Prosser, WA
N6576E
[quote="hgmckay"]
> I have a Rotax 912 UL engine on an Allegro 2000 LSA. Recently I have had to
replace my battery (12V 18Ah) because of it's inability to crank the engine. Prior
to replacing the battery I noticed my combination Volt/Amp meter showed only
12 volts while flying. Usually the voltmeter shows about 13.5 volts at start-up
while the engine is running on the ground and while flying. After replacing
the battery, and starting the engine the voltmeter returned to 13.5 volts.
However, when I began to close certain circuit breakers engaging the front landing
light, the two wing tip landing lights, the two wing tip strobes, and the
nav. lights I noticed the volt meter dropping back each time I engaged one of
the breakers until finally the volt meter again was indicating only about 12
volts just as before. I have a "no charge" red light in the battery charging
circuit that comes on if the battery is not being charged while the engine is
running. This light normally does not come on unless the engine is at very low
rpm ( aprx.1400 rpm). This is not normal for my engine for my idle speed is
set at 1800 rpm.
>
> I do not know why the voltage is dropping each time I close the breaker for
lights described above, or what may be causing the voltage drop. I know I have
a good battery, but I don't know if my regulator is going bad, or if there may
be aground some where, or somthing else. Can anyone shed any light on what may
be causing this? The engine has only 255 hours on it and I have not had any
other problems with the engine. Any help would be greatly appreciated.
>
> Hugh G. McKay III
> Allegro 2000
> Rotax 912 UL
> N661WW
>
> hgmckay@bellsouth.net (hgmckay@bellsouth.net)
>
>
> [b]
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=334470#334470
Message 2
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| Subject: | Rotax 912 Battery Discharging Problem |
I am having a similar problem to the one Hugh McKay had a few years ago. My problem
though is simply that the battery is not being charged. The voltmeter show
12 volts at startup and slowly drains down from there (faster if I turn accessories
on). Noticed this while flying yesterday when the voltmeter was pegged
on the high end. Landed and suddenly started getting a lot of static in headset.
Turned off heater and static disappeared, but voltmeter dropped to zero. Noticed
landing light had been accidentally turned on - turned off and volt needle
swung to high side again. As I turned switches off the needle would swing
from high to low. Finally shut down. But when I tried to restart volt meter read
only around 9 volts and engine wouldn't turn over at all. Recharged battery
today and engine started with 12 volts showing and none of the other switching
problems. But juice continued to dribble away.
Any suggestions??? Bad ground??? Bad regulator???
Bill Nelson
Prosser, WA
N6576E
[quote="hgmckay"]
Quote:
I have a Rotax 912 UL engine on an Allegro 2000 LSA. Recently I have had to replace
my battery (12V 18Ah) because of it's inability to crank the engine. Prior
to replacing the battery I noticed my combination Volt/Amp meter showed only
12 volts while flying. Usually the voltmeter shows about 13.5 volts at start-up
while the engine is running on the ground and while flying. After replacing
the battery, and starting the engine the voltmeter returned to 13.5 volts. However,
when I began to close certain circuit breakers engaging the front landing
light, the two wing tip landing lights, the two wing tip strobes, and the nav.
lights I noticed the volt meter dropping back each time I engaged one of the
breakers until finally the volt meter again was indicating only about 12 volts
just as before. I have a "no charge" red light in the battery charging circuit
that comes on if the battery is not being charged while the engine is running.
This light normally does not come on unless the engine is at very low rpm
( aprx.1400 rpm). This is not normal for my engine for my idle speed is set
at 1800 rpm.
I do not know why the voltage is dropping each time I close the breaker for lights
described above, or what may be causing the voltage drop. I know I have a
good battery, but I don't know if my regulator is going bad, or if there may be
aground some where, or somthing else. Can anyone shed any light on what may
be causing this? The engine has only 255 hours on it and I have not had any other
problems with the engine. Any help would be greatly appreciated.
Hugh G. McKay III
Allegro 2000
Rotax 912 UL
N661WW
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=334471#334471
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