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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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