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1. 01:25 PM - Re: Erratic voltage output (Carl)
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| Subject: | Re: Erratic voltage output |
Hi Doug
You stated you have no loose contacts, you could have a poor contact.
Two years ago I had an intermittent charging problem that took two day
to trace. It was in an in-line fuse holder, the rubber coated ones that
take ATC fuses. The fuse looked fairly normal but when I cut the holder
open it was corroded and burnt. Replaced problem gone.
Carl
----- Original Message -----
From: MacDonald Doug
To: rotax list
Sent: Friday, June 14, 2013 10:44 AM
Subject: RotaxEngines-List: Erratic voltage output
I'm having an erratic voltage output problem on my 912UL powered
CH-701.
To try and fix the problem I have replaced the voltage regulator and
verified I have no loose connections in the electrical system. Even
with a new regulator I am still getting the same voltage spikes when at
full power. At idle and during run-up the voltage reading on my analog
VDO voltmeter is rock solid. It indicates about 14 volts once up off of
idle power and my digital voltmeter show about 13.6 Volts. Once I apply
takeoff power the analog voltmeter needle starts to vibrate wildly plus
and minus about 1-2 volts and the digital voltmeter becomes unstable.
If I am flying with a light electrical load, the digital voltmeter tops
out at just over 14 volts but drifts around as low as 13.7. If I put on
my nav and strobe lights the voltage drops to 13.3-13.6 range but the
needle on the analog meter continues to vibrate the same.
The only other components (beside the regulator) in the electrical
system I can think of which might be causing the voltage spikes are the
capacitor or a problem with the actual alternator coils. I thought the
problem may have been a bad analog gauge but given that the digital
readings are also erratic I believe it to be a legitimate issue and not
simply a display problem.
I'm pretty good at chasing electrons but this issue has me stumped.
Anyone have any ideas what could be causing my erratic voltage output?
Doug MacDonald
CH-701, Northwestern Ontario
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