Look at the newer service manuals when you talk about changing parts. Komatsu is notorious, and CAT isn"t far behind, for saying to do a check and depending on the result change a part (wether it"s a $1500 computer or a $20 wire connection) and then redo the check. Depending on the result as to wether the changed part was actually the problem. The CAT I mentioned I mentioned working on was the same way. Check code, follow flow chard, change stated part, redo check, follow flow chart til the same or another problem/part showed as bad.....and on and on. I love working on the older stuff, it has it"s monents but typically you can see what the problem was, not change $$4000 worth of parts an have the problem disappear and all you know is that there was a problem with one or more wires "somewhere" in the 2" diameter, 25 foot long bundle of wiring. That will make anyone feel like a parts changer wether they really are or not.
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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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