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[+]ardvarcus0 points2 points2 points
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(edited ago)
[–]ardvarcus0 points
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(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.
[–]level_1010 points
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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.
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[–] ardvarcus 0 points 2 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.
[–] 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.