Posted by Jon Hagen on July 06, 2013 at 15:08:48 from (69.26.17.61):
In Reply to: Re: A poser posted by Don R of Mn on July 03, 2013 at 12:34:21:
I agree on the "1 wire" alternator of the Delco 10SI type, NOT causing any battery drain. There once was a type that had the "1 wire" regulator connected to the BAT stud inside the alternator, that would cause a small parasitic drain on the battery, but I have not run into one of those for nearly 30 years. Most of what you see today in a Delco 10SI " one wire" alternator are electrically identical to the standard "3 wire " alternator. The modern "1 wire" unit has nothing changed except the internal regulator. No battery voltage is avlalible to the "1 wire" regulator, as it is only connected to the field circuit, (the diode trio, regulator and rotor.) Battery voltage to the internal parts is effectivly blocked by the 6 diode rectifier assy, exactly as it is in a stock "3 wire" alternator.
It is very easy to test your "1 wire " alternator to make sure it does not have a design that will slowly drain the battery. With the tractor not running, but with the battery connedcted, remove the big tractor harness ammeter wire that attaches to the BAT stud on the alternator rear. Connect your digital VOM to the bat stud and the harness bat wire, with the meter set on Milli amps, so you can read any parasitic drain from battery to alternator. I would bet that in 99.9% of "1 wire" Delco alternators, the reading will be exactly the same as any stock "3 wire" alternator, 3 Milli amps or less, with all of that from slight leakage of the rectifier diodes.
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