Posted by da.bees on September 28, 2017 at 18:15:29 from (68.203.133.191):
The 600 Ford with 12 volts has turned the engine very fast all along until it didn't turn at all one day. After removing the band covering brushes,I can see that all brushes are worn out and one is worn so bad it's falling out of holder between commuter and brush holder. I am considering one of the $16 brush,clip and bushing kits available from YT parts. As might be expected,the commuter is burned and pitted. Is it mandatory to turn the commuter or is sanding sufficient? If sanding,which should be used, crocus cloth,emery cloth,sand paper or wet-dry sandpaper? Back when generator were common, I've heard yea and nea on all of them,because of grit imbedding into the copper and/or conducting electric current.I suppose the conductivity issue would be easy enough to prove or dis-prove with an ohm meter but grit imbedding is not so easy. Then there's the question of how succesful shade tree rebuilding really is. I haven't dealt with a starter or generator failure in 50 years and back when I did,there were helpful one man repair shops on every street corner. I bet dealer mechanics have never heard of a growler,much less know how to use one.
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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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