Back in the late 50's I put a resistor bypass starting system on Dad's Moline GB propane tractor. They originally came with a 12V coil that did not need a ballast resistor. The tractor was a poor cold weather starter and was hard on points, usually had to replace them twice per year. We had a wrecked 55 Chevy with ballast resistor and matched coil that was a great cold weather starting car. I wondered if I could improve the tractors cold weather starting by fitting it with the Chevys resistor bypass ignition system. I fitted the Chevy coil and ballast resistor to the tractor , but the Moline did not have the 4th solenoid terminal to bypass the ballast resistor while cranking. I knew I could not connect a bypass wire directly to the starter stud as it would back feed power from the coil into the starter which would short out the ignition. I got around that by using the 55 Chevys horn relay to feed 12V to the ignition coil to bypass the ballast resistor and feed 12V to the coil for better spark when cranking. When not cranking, the relay opened the connection to the coil so I would not back feed to the starter. The system cobbled together out of junked Chevy parts worked well. The tractor would now start in much colder weather, but also a set of points would last an entire year, so I suspect the Chevy coil and ballast resistor must have pulled less amps through the points which about doubled point life.
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Today's Featured Article - Tuning-Up Your Tractor: Oil, Oil Filter and Air Breather - by Curtis Von Fange. In the preceding articles we discussed some of the various aspects of doing a comprehensive tune up. Hopefully some light was shed on why we do or don't do certain things pertaining to inspections and order of events when doing a tune up. Perhaps some useful reasons were given for why parts fail and what to do about preventing part failure in the future. All these tips will help us think and reason out a problem in order to make our tune up last and, hopefully, keep us from spending extra mone
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