I suspect ammeters are gone now mainly because of safety and cost. 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. Adding electrical loads and/or upgrading alternators can overload these circuits or the gauge too.
Volt gauges can be safe, they can be wired with small gauge wires with low amperage circuit protection. They will indicate if the charging system is working, They can also indicate the battery state of charge before engine is running and also indicate an over charge immediately. So, volt gauges are cheaper, safer and actually offer a little more information than an ammeter. If someone wants to know it all then use both.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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