---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Sat 06/15/13: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:25 PM - Re: Erratic voltage output (Carl) ________________________________ Message 1 _____________________________________ Time: 01:25:32 PM PST US From: Carl Subject: Re: RotaxEngines-List: 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.