Posted by Owen Aaland on September 14, 2011 at 17:35:07 from (216.47.32.147):
In Reply to: Super A to 12 volt posted by David Lampman on September 13, 2011 at 22:50:18:
The Delco One Wire alternator uses only one wire. The ground is back through the frame. The voltage sense and excite connections are made internally in the regulator. Because of this the excite wire has a current draw even with the engine shut off. On some alternators this draw may be enough that you can have trouble starting the tractor if it sits a few weeks without being used. The current flowing through the excite terminal goes through the rotor windings an its way to ground. Since the current draw is so small the resulting magnetic field created in the rotor is also small. The smaller the magnetic field the faster the rotor must turn before it can begin to charge. One it begins to charge the alternator RPMs can be brought down to an idle and it will continue to charge.
The advantage of the single wire is that it the easiest to install, especially if you do not have to change the battery polarity. You can usually just take the wire from the A terminal of the generator and connect it to the alternator. Connect the Gen and Bat wire together at the regulator and you are set to go.
The disadvantages are that it always has a draw through the alternator and will shorten battery life if not used regularly. It also requires a higher RPM to start to charge, on some it may be near full throttle.
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