Voltage Regulator bad
When your battery gage reads high, it means that your voltage regulator is shot. Your voltage is too high. You are about to wreck your battery and some of your electronics. You are facing an extremely expensive repair job if you do not get a fairly inexpensive part fixed.
The battery light comes on when the alternator output voltage is too low or too high. You have a wiring or regulator problem.The battery light comes on when the alternator output voltage is too low or too high. You have a wiring or regulator problem.
With the engine running you should read 13.5 to 15.5 Volts DC at the battery posts. A reading much higher than this indicates the voltage regulator in the alternator is defective.
Either your engine coolant temperature is too high , your oil pressure too low , or your gas gauge is near or at empty
if you keep a phone on the charger for too long, (for instance, all night,) then the battery will actually not last as long
Check the alternator. If the voltage is too high it will overcharge the battery and destroy it. If the voltage is too low the battery will discharge and could be mistaken for a destroyed battery.
The check gage light comes on if the engine coolant temperature is too high , the oil pressure is too low , or the gas gauge is at or near empty
The output voltage from the alternator is either too low or too high.
On my 1995 Ford Explorer the " check gage " light will come on if the engine coolant temperature is TOO HIGH , the oil pressure is TOO LOW , or the fuel gauge is at or near empty
Either your ENGINE TEMPERATURE is too high , the Oil Pressure too low , or your gas tank is at or near EMPTY
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that depends on what your voltage gages says while the car is running. while the alternator is spinning, it should generate 13 to 18 volts. if that's the case, your alternator is fine. If not, you need to replace it. it won't charge the battery, giving you about 20 minutes of drive time, but the more you drive the battery like that, the more you will stress it out. if you stress the battery too much, it may go bad on you too. you can get the battery and alternator tested at most auto parts stores. many stores will even test your parts for free.