Posted by Owen Aaland on December 27, 2011 at 08:24:12 from (216.47.35.28):
In Reply to: alternator exciting posted by Fixerupper on December 26, 2011 at 16:58:23:
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I would guess that he was using a single wire regulator. Even then that would put the alternator speed at 4000 - 5000 RPM before starting to charge.
Most of the alternators I rebuild are 72 amp. When I put them on the test stand they will start to charge at between 600 and 800 RPM. That is with feeding battery voltage to the excite terminal. The more resistance you have in that wire the high the RPM will be before the alternator starts top charge. Once they start to charge the will continue to charge until the speed again drop below the 600 - 800 RPMs.
The alternator should be running at 2.5 - 3.5 times the speed of the engine crankshaft. Since the older tractor engines are not high speed you can go much higher than 3.5 and be alright.
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