The pto has to have power to stay engaged. The pto as you call it is just electrical magnets. If I remember correctly, you should hear the magnets engage [click] when you switch on the power even when the motors not running [with a good battery, the battery charger on or the jumper cables connected]. If you leave the jumper cables on I'm guessing the blades will continue to turn after starting. I think as stated that it has a bad battery or bad conections. Try putting it on a battery charger and after a short charging period, start the tractor with the charger still on. Even if the battery is weak, it should stay running with the mower running. If so, you may want to buy a new battery. If the battery is fully charged, even if the voltage regulator is bad it should run and engage the blades. The only thing that would happen is that after a while the battery would lose its charge. This post is from past experience on a JD 111 I once had. Good luck.
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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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