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What is the purpose of the top middle gauge in a 2010 Armada? Is it indicating the battery voltage, or is it showing if the battery is being charged/discharged? For 10 years, my gauge has been indicating right in the middle, which seems to be around 12 volts. But, after installing a new battery last year, it typically shows to the right of middle, resting between the middle and the first hash mark on the right. Does that mean I got a crap battery, or does it mean the alternator is going bad?
 

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That is actually where it should be. When the engine is running, the battery should be at about 14 volts. These trucks have a "smart" alternator that is supposed to vary the amount of voltage that the alternator puts out in order to increase MPGs. In reality, the system doesn't have any effect on MPGs but does kill batteries. Many of us have bypassed the smart part of the alternator so that our batteries get the full charge they are supposed to have.
 
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