Posted by k6zrx on April 20, 2014 at 19:50:29 from (71.138.137.57):
In Reply to: Amps and volts posted by Notjustair on April 20, 2014 at 18:08:30:
The only way you can really know what is going on with the charging system is to have both. You can have proper voltage, and a battery that is not taking a charge. You can also have amps flowing, but the voltage is too low, so the battery won't be fully charged.
As other have said, a amp meter requires the full amount of current to flow through it or an external shunt. Volt meters are easily wired with small gauge wires. Lights are cheaper yet since they don't need a meter movement.
If there is only one gauge, I feel that an amp meter gives the most useful information to the driver/operator. Voltage can be estimated by the brightness of lights. I have both in my cars with generators that also have two way radios, factory amp and add on voltage.
Some makes of cars and trucks with oil pressure gauges (Ford comes to mind, I had one. Add on gauge read lower at hot idle), don't really read anything but a switch. The gauge is either in the "normal" range or "low". Lets hem sell a gauge package without the expense of a real sending unit.
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