Doug, A jumpy ammeter can be an indication of a genny commutator thats all oily or dirty n carboned up and/or worn down brushes or weak or stuck brush hold down springs. Check n clean n polish the gennys commutator n check the brushes n clean n exercise n light lube the brush hold down springys..
Next Id remove, clean n wire brush n reattach each n every VR n Genny terminal/connection as well as each n every battery n starter n ground connections. MAKE SURE THE VR AND GENNY BOTH HAVE GOOD CLEAN GROUNDS !!!!!!!!!!!!!!!
Does the VR match your ground?? Some VR's are labeled for Pos ground others Neg soooooooo make sure you have the right one or it may not last as long
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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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