You will reach for a multimeter many times in your life once you have one. Don't even need to be terribly accurate for most people. Just keep 240v for electrician.
YouTube will teach you enough for automotive use.
Over say 15v when revved to 3000rpm and your regulator is stuffed. Less than 13.5 when revved and I'd be expecting a burnt alternator (which you can then test as an AC voltage on stator connector unplugged when running) or perhaps a stuffed battery or misbehaving component dragging things down.
Probably just the battery but its worth being educated. Jaycar have a range for many price points.
Don't you look at my accountant.
He's the only one I've got.
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