Posted by Notjustair on April 20, 2014 at 18:08:30 from (174.237.163.235):
I was moving tractors today to grind feed and had a thought. That's dangerous in and of itself.
Why did the industry (auto and machine) move away from amp (ampere) gauges to volts?
When things were 6 volt (and for a while after the switch to 12) amp guages were king. The tractors I have here that are that old have amp guages. I fire them up and watch the oil and amp guages to make sure everything is working. On the newer tractors I do the same but wait to see the volts come up.
The only thing I have seen have both were the school buses I drove (Ford). For whatever reason they had an amp guage as part of the factory cluster and then a volt meter added on separate (a Ford unit not the body builder). Those always had both but that was the only thing. The last new vehicle I remember having an amp guage was a conversion van - 1982 model.
Did the switch come as people quit doing their own repairs/maintenance and no longer understood how amps work? I find that when I have an amp guage I watch it like a hawk. The grain truck is an example. It is 12 volt with a generator so I watch to make sure it picks up when I pull away from a stop. With an alternator there isn't much fluctuation but that truck runs from -15 amps to +15 amps at night with every stop or turn.
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