Posted by rtr on May 24, 2020 at 18:23:58 from (107.77.233.101):
I’m curious as to what causes a problem I am having with a Massey Ferguson 135 gas tractor. I’ve also had the same problem with a Farmall Cub and a Farmall 140 tractor ......all of which are key start systems. When starting the tractor and turning over the starter with the key switch, The switch is not letting fire/battery power to the coil. When the key/starter is released, it allows fire to the coil then. Basically when the key is on the “on” position you have power to the coil but in the momentary start position it doesn’t have power.
Is this a simple wiring issue I have made a mistake at, or does this mean the key switch is bad?
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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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