As miangus posted the diesel wiring is different. The alternator will be excited from the oil pressure switch. I do not have a 175 wiring diagram to rework for you, but from other MF diagrams I have, I believe there are connections for other things, made at the external regulator, which will need to be addressed as part of eliminating it properly. You will need a diode in the new excitation wire which will need to be run from the oil pressure switch (normally located behind the oil pressure gauge in the dash). You can purchase pigtails for the alternator with diodes already in them to save chasing for a diode to build your own (or adding a resistor or indicator lamp).
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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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