Robert I have been wiring up tractors like this with the 3 wire alt. I use a ford starter relay. I go from the bat. on the switch to the bat.side of the relay.the acc. on the switch to the no1 on the alt. the ing. to the bat. side of the coil.The start on the switch to the small post on the relay. The no2 on the alt. to the heavy post and the heavy post to the - side of guage. the +side of the gauge goes to the bat. HTH
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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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