Any certificated alternator for a light aircraft will have Battery, Field, and Ground connections. That's it as they all use external regulators, whether mechanical or electronic. If you apply 12V to the field, there should be an output on the Battery line. It's that simple. That's why the regulators are usually interchangeable as well. All the regulator does is sense the battery voltage and regulates the voltage going to the alternator field to control the alternator output. So, if you want a wiring diagram, pick out almost any aircraft alternator wiring diagram. They are all very similar as they are all using the same fundamentals. I would suggest using a Plane Power installation diagram as their paperwork tends to explain the operation. The Aux wire on the Plane Power alternator that goes to the Aux terminal on the regulator is unnecessary and is there to trigger the "Alt Failure" light on the panel or electronic display, so your friend's alternator may or may not have an Aux terminal. If I was going to attempt to diagnose it, first I would check the wiring. If the wiring is correct and has good continuity from termial to terminal, I would verify there is voltage present on the Field from the regulator. If there isn't, the problem is in the wiring or the regulator. If there is voltage present on the field line and no output from the alternator, then the problem is probably the alternator. If his alternator is internally regulated, then all bets are off, but they are a very simple installation. With an amatuer built plane, you can't assume anything to be correct, so check continuity of everything, right down to the crimps on the wire terminators and check that the wiring is actually correct. -Jeff Scott Cherokee Village, AR
Sent: Wednesday, March 14, 2018 at 5:27 PM From: "Flesner via KRnet" <krnet@list.krnet.org> To: krnet@list.krnet.org Cc: Flesner <fles...@frontier.com> Subject: KR> alternator wiring? I'm helping a friend finish a Murphy Rebel with a Lycombing 0-320. We managed a first engine run but found no alternator output. He is using an "Electrosystems ALX8421LS. Does anyone have a photo or wire diagram for this alternator so I can check it for correct wiring? I've checked all over the net with no luck on a schematic for this unit. Any help appreciated. I managed a 20 minute around the patch flight in the KR today. Lots of sun but chilly and very bumpy. This cool weather keeps the oil temp from warming above 160 F. I'd like to see 180 F minimum. Spring soon................ Larry Flesner __ _______________________________________________ Search the KRnet Archives at https://www.mail-archive.com/krnet@list.krnet.org/. Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options. To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org
