To use a voltmeter effectively for accurate measurements, follow these steps:
If the alternator is only putting out 12 volts then it is defective and needs replacing. It should output from 13.5 to 15.5 volts DC. You will need a digital volt meter to get an accurate reading. Analog volt meter is not accurate enough.
Depends on the test instrument and the currents involved. I use a fairly inexpensive digital volt/ ohm meter, and it reads in 1/10 of a volt increments.
The volt.
Volts
Parallel
It depends on what you want to monitor. Most commonly the volt meter is connected in parallel with the battery or the alternator.
Purchase, borrow, or have someone with a volt meter or multimeter check it for you. If you don't know what a volt meter or multi meter is, have an electrician check it for you.
There is no volt meter or amp meter in a DC watt meter.
Yes
as a tester
Volt-Ohm Meter
A