Posted by TractormanNC on October 28, 2009 at 19:26:39 from (209.42.181.116):
In Reply to: Re: 12 volt system posted by Janicholson on October 28, 2009 at 18:04:49:
Hey Jim, I agree with you, John T and Bob M about using a three wire alt instead of the one wire.
You guys probably know this but I have never seen it addressed in the approx 3 years I've been on this board. Any alternator is going to have SMALL amount of drain thru the rectifier bridge. In addition, if you look at the schematic of the electronics inside the internal regulator, there is a resistive voltage divider from the #2 terminal to ground that always draws a SMALL amount (microamperes or less) of current.
In addition there is a noise suppression capacitor in the alternator which can become leaky. (never seen it happen though). This cap will also cause a small spark when the final battery connection is made or when the wire is attached to the alt bat post. SOME inexperienced persons may mistake this spark for leakage. The way I check is to make the connection and let it spark, remove the connection and remake it. If there is a spark the second time, I have a leakage problem.
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