On the same subject, there are also now low-priced permanent-magnet alternators/generators. $50-$60, tiny, and rated 14 amps. Price is kind of amazing since not long ago - Delco 10SIs were being converted to permanent magnet and selling at times for near $200.
So just in case someone needed a really tiny alternator with no field-current power needed, here it is.
14 amps is plenty for many small tractors if mainly just for battery charging and maybe a few lights once in awhile.
One drawback is the belt pulley on these little units. I do not know if a wide-groove pulley is available.
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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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