Ideally you will have both an ammeter AND voltmeter (my old Kenworth has both...). This gives the most complete information on operation of the charging system. However if I can have only one of the other I prefer the voltmeter.
A voltmeter is easy to wire - no heavy wiring needs to be brought to it as with an ammeter. (Only a single light gage wire + ground are needed).
Depending on the resistance of the voltmeter it's OK to leave it permanently connected. (A good, high resistance voltmeter's current drain is much less than the self-discharge current of a good battery)
However it's easy to wire a voltmenter to turn off when shut down: Simply connect the + post on the voltmeter to either the IGN or ACC terminal on the ignition switch.
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Today's Featured Article - Tuning Up Your Tractor: Cooling and Fuel Systems, Hoses and Belts - by Curtis Von Fange. Our tractor is coming right along. The old oil and filter has been taken to the recycler and the air filter replacement has breathed new life into our motor. Let's take a closer look, now, at the cooling system since it has to work so hard in the summer heat. Cooling systems can be real cantankerous in their old age. Radiator cores clog up with rust, lime or other mineral deposits and the fins clog up with weed seeds and debris. The metal headers slowly corrode away from years of use and
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