Had a newly rebuilt alternator installed on my Bronco II a few years back. Would drain the battery when sitting at wife's place of work. What happened was that the voltage regulator although new, was defective. When wife would park car, go around to passenger side, open door to get her stuff out, the dome light would come on triggering the voltage regulator to switch on due to system (battery) voltage drop. Regulator would then allow field in alternator to be energized, even though the engine was off. This discharged battery over the day's shift, and no go at the end of her shift. Took some real detective work to figure that one out. Then, we replaced regulator with new out of stock, couple times, with new. And they were defective as well! Finally dug old one out of scrap box - put it back in, worked fine as long as we had the car.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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