---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 01/02/22: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:38 PM - Alternator Field Failure? (farmrjohn) 2. 07:20 PM - Re: Alternator Field Failure? (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 05:38:28 PM PST US Subject: AeroElectric-List: Alternator Field Failure? From: "farmrjohn" I have an O200 with a TCM 633661 alternator and Zeftronics R15V00 Rev. A regulator. On my last flight charging to the bus/battery stopped. After replacing the regulator with a know good one and still no charging I started to follow the Zeftronic installation/trouble shooting instructions. Checking the resistance for the field resulted in infinite resistance from the field terminal to ground whereas the instructions indicated 3.5-6 ohm is normal resistance. I'm assuming this would indicate a break in the field wiring and hence no charging or could the problem be something else?. If so, is this repairable? Are there alternative alternators (certificated airplane) if replacement is necessary? Thanks, John Read this topic online here: http://forums.matronics.com/viewtopic.php?p=505569#505569 ________________________________ Message 2 _____________________________________ Time: 07:20:40 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Alternator Field Failure? At 07:37 PM 1/2/2022, you wrote: > >I have an O200 with a TCM 633661 alternator and Zeftronics R15V00 >Rev. A regulator. On my last flight charging to the bus/battery >stopped. After replacing the regulator with a know good one and >still no charging I started to follow the Zeftronic >installation/trouble shooting instructions. Checking the resistance >for the field resulted in infinite resistance from the field >terminal to ground whereas the instructions indicated 3.5-6 ohm is >normal resistance. I'm assuming this would indicate a break in the >field wiring and hence no charging or could the problem be something >else?. If so, is this repairable? Are there alternative alternators >(certificated airplane) if replacement is necessary? Thanks, John > There are carbon brushes that ride on slip rings to conduct output from the regulator to the moving field coil. These are a service-life limited part . . . they wear out. Since this is a TC aircraft, regs require service by a 'qualified' facility. But if you're adventuresome, you could disassemble it for inspection and see what the brushes look like. A spec-rebuilt alternator is breathtakingly expensive . . . over $1500 Bob . . . Un impeachable logic: George Carlin asked, "If black boxes survive crashes, why don't they make the whole airplane out of that stuff?" ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-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/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-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.