Re: 12V one wire alternators

Posted by Bob on September 04, 2006 at 21:06:27 from (66.163.134.211):

In Reply to: 12V one wire alternators posted by Ray Martin on September 04, 2006 at 15:40:40:

Do yourself a favor, and get a STANDARD 10SI Delco alternator.

They are EASY to hook up, are cheaper, and more readily available, and will begin to charge at lower RPM"s than the GOOFY "one-wire" units.

All you need is a few simple connections, as shown here, and a diode, as shown, or an "idiot light" using a #194 lamp.

The diode in the lead to the alternator"s #1 "switched excite" terminal, OR the light bulb, spliced into the same wire, are DIRECT substitutes for each other.

(If using an "idiot light" the diode will NOT be spliced into the harness, as shown, instead, the same wire will lead back to the switchbox, and be connected to the "idiot light", and the other terminal of the "idiot light" will connected to the "switched" side of the ignition switch.)

If the tractor has a mag, you can use a 4 psi oil pressure switch in the "excite" circuit, since all the tractor would have is a "kill switch".

Linked below, are more diagrams, from Bob Melville"s site. #9 is the oil pressure switch/mag diagram.

• BobM's diagrams

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