Hi Sid I don't think that is a field driven alternator rather it is a permanent magnet alternator or dynamo. There is no field coil that is energised by the regulator. It's not needed, the magnets provide the field and it is unadjustable except by changing engine speed.
The two wires you refer to I suspect are the AC output from the perimeter coils where the current is induced by movement of the magnet within it. More than likely they are the same colour (often blue or black). The current flow is positive in one wire and negative in the other and that reverses many times as the magnet rotates and the positive and negative poles pass by a coil. The AC is rectified by the regulator to produce DC which is then smoothed and regulated to provide 13.8v DC nominal. It is exactly analogous to the John Deere setup or that found in Harley motorcycles. You are correct, by disconnecting one or other of the two wires the alternating current flow is disrupted. However there will now be a very high voltage drop across the ends instead which has potential to break down your coil insulation. Crowbar overvoltage protection concepts and circuit diagrams are provided at Bob Nuckolls aeroelectric site. www.aeroelectric.com I hope this helps you better understand your electrical system. Regards John John Martindale 29 Jane Circuit Toormina NSW 2452 Australia ph:61 2 6658 4767 m:0403 432179 email:john_martindale at bigpond.com web site: -----Original Message----- From: KRnet [mailto:krnet-bounces at list.krnet.org] On Behalf Of Sid Wood via KRnet Sent: Saturday, 3 October 2015 8:17 AM To: krnet at list.krnet.org Cc: Sid Wood Subject: Re: KR> Electrical System I do not know any thing about the John Deer alternators. The Diehl alternator consists of permanent magnet array bolted to the fly wheel, a set of coils with iron cores bolted to the Diehl adapter case and a quite small regulator usually mounted on the firewall. Two wires from the adapter case hookup to the regulator. One wire is for the field and the other wire is for the alternator output. Without the field wire connected, the alternator has no ........snip ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2015.0.6140 / Virus Database: 4435/10744 - Release Date: 10/02/15
