Posted by tldnc on October 12, 2019 at 18:55:53 from (71.69.92.41):
I changed the voltage regulator on my MF 135 with a Perkins gas engine. After plugging the wire plug into the regulator and connecting the battery cables I turned on the key switch and the gas gauge registered about 1/2 full (which is about right for amount of gas in tank). Turn key switch off and fuel hand goes to empty. Started the tractor and after about 5 minutes of use stopped and shut off engine. Gas gauge stays at 1/2 full. With the key in the off position the wire from the voltage regulator to the fuel gauge is still energized until the ground cable is removed from the battery then the fuel hand drops to empty. Put the cable back on the battery and the fuel hand goes back to 1/2 full. What is the answer to why this wire stays hot?
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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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