Jump boxes and jumper cables will usually not carry enough current through the clamp ends to work effectively. Are you running 12 v or 6 ? really doesn't matter at this point , but 6 V is more touchy about cable size , and when hooking the jump box on was the battery also hooked up ? or just jumping at starter only with no battery help ? If you have a bad battery it can drain power away from your jumping attempts.
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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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