Sounds like current is getting to the starter motor but it isn't turning. If the motor was ok and getting juice and was unable to turn the flywheel you would at least hear the magnets buzzing. Remove the starter and bench check it. That will eliminate connection issues from the battery, etc. and you can separate the motor from solenoid problems. If the starter is not turning, it's likely that the 50 year-old Delco starter just needs to cleaned and may need a $25 brush kit. Easy to open it up and remove the armature, blow out the dirt and clean all the copper surfaces. The spring loaded assembly that holds the brushes against the armature gets corroded and stuck, so the brushes aren't working the way they should.
This post was edited by Married2Allis at 08:42:27 08/24/15.
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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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