Why is my amp gauge reading high?

If the current is filling the battery, the gauge goes high. If the current is draining the battery, it goes low. So, when the gauge is high, after a mile, unless the battery was really low, then you have a battery drawing current from the alternator for unhealthy reasons.

Is it safe to leave battery charger on overnight?

Even though there is no risk of overcharging with the use of a high quality charger, the battery should not remain connected to the charger for more than 24 hours. A full charge is usually achieved by charging overnight. Even after a deep discharge, some chargers enable at least partial reconditioning of the battery.

Why does my battery gauge go up and down?

When the batterys state of charge is low, the voltage is raised slightly to quickly put the charge back in. When the state of charge is high, the voltage is lowered slightly to prevent overcharging. If the vehicle has a voltmeter gauge, you may see the voltage move up or down. This is normal.

Is 14.7 V too high?

An ideal reading is between 12.4V and 12.7V. Some experts say a reading above 12.6V is better. As soon as your engine is switched on it should increase to 13.7—14.7V. If it reads below 10V, your battery is going to die very soon.

How do you know if alternator is overcharging?

Symptoms of Your Car Alternator Overcharging:Car Battery Voltage Gauge Reading is High. You notice a high voltage reading on your cars vehicles dashboard. Car Battery Gets Hot When Charging. Your Headlights Burn Out Quickly. Your Car Battery is Bulging on Sides.