Defective battery gauge
The battery gauge, or voltage gauge, measures the amount of power in the electrical system. If it can no longer function properly, a problem in the charging system may go unnoticed.
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Gauge is Always High or Low
If the voltage gauge is consistently at the low end, and the vehicle's electrical accessories seem to be function normally(such as normal headlight and interior light brightness), the gauge may be defective.
On the high end, however, there could be a problem with the voltage regulator and the charging system is overcharging.
If the gauge returns to low when the engine is off or is restarted, it may be wise to have your charging system checked. If the gauge remains on high after the engine is off, the gauge may be broken.
Category: Electrical and Charging