Re: Re: Three wire alternator with only one wire c

Posted by Jon H on July 07, 2004 at 12:03:04 from (69.26.18.65):

In Reply to: Re: Three wire alternator with only one wire conne posted by Bob on July 06, 2004 at 22:37:00:

I would also bet the alternator Has been fitted with a 1 wire regulator.
That being said,I have on atleast two occasions Had a 3 wire Delco 10SI alternator with a stock three wire regulator self excite without any power to the Regulator excite wire (#1).
I use a home built alternator/generator test stand where I disconnect the battery when the stand will not be used for a day or so. I use a Delco regulator plug with both #1 and #2 wires connected together and fed power through a small ammeter to read field current draw.
The alternator output is connected to a large ammeter and a carbon pile to test output,and all this powered by a Battery.
At least twice I have connected a repaired 10SI Delco to the test stand and spun it up only to see the voltage come up to normal,but not indicate any output to the battery/carbon pile. In both cases I had not connected the battery to the test stand,yet the alternator had excited itself from residual magnetism in the rotor poles,just like one with a 1 wire regulator.
A sensitive stock 3 wire regulator can self excite the stock alternator,but should charge unregulated if the #2 (sense) terminal is not connected to output voltage. The 1 wire regulators work without a sense wire connected,so I suspect they read system voltage internally from the Diode trio.

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