" Its not safe to have all the electrical power running through an ammeter and it costs more to do so. Running at least a 10ga or larger hot wire from the alternator, into the cab or dash and back to the battery or +bus can create hazards and also be problematic if connections get loose or wiring shorts to ground."
For MANY years GM used a current shunt under the hood and light wires that were also fused to the Ammeter in the instrument panel.
Likely, some others did to.
Kinda debunks your theory of heavy wires to an Ammeter.
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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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