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[–] ardvarcus 0 points 2 points (+2|-0) ago  (edited ago)

You can tell if your battery is discharging or charging, and that way you know if you need to check your ground wire, or terminals, or get a new battery or new alternator. If you are driving around and your gauge shows a steady discharge instead of a charge, it won't be long before your battery is flat and your car won't start. You can also get an indication when you have a short circuit in your wiring. It's a very useful gauge to have.

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[–] level_101 ago 

I agree, this is why I will be spending 1-2 hours tomorrow replacing an alternator that is half-dead... Without the indicator I am not sure I would know that it was failing before it got to the point that it wouldn't start at all and the battery is dead.