Back when I was a kid working the parts counter at the family's Farmall garage, the "universal" letter-series Farmall spark plug was the Champion D-15Y...a replacement for the old D-16.[Also fits the 300, 350, 400,and 450 gas tractors.] If you knew that info, it's easy enough to use a crossover chart to get the brand of plug you prefer.
BIG part of the problem is that places like O'Reilly's pay doodly-squat, so you only get counterpersons who'll work for doodly-squat, and who know LESS than doodly-squat. A couple of years ago, I applied for a position at my local O'Reilly's...with my associates degree in automotive management and my 30+ years of parts experience, they were willing to start me out at a generous $8 an hour. When I told the store manager that I was making $11 at my then-current job, he exploded that HE didn't even make that much! I refrained from making any further comments, except that it appeared I wouldn't be working for them.
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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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