Q: The "service battery charging system" light is on but the voltage gauge is reading over 14 volts

asked by on

The "service battery charging system" light is on but the voltage gauge is reading over 14 volts so I am thinking it is the battery and not the charging system

My car has 50000 miles.
My car has an automatic transmission.

Hello There, Depending on how much over the 14 volt mark your gauge is reading, you may have a voltage regulator that could be overcharging the battery at a rate that is too high relative to what the system requires. The voltage regulator is a unit that regulates the charging of the battery by the alternator. When the voltage regulator is not working properly, this may result in the alternator allowing too much power to be delivered to the battery resulting in damaging wires and prematurely sometimes destroying the battery. A common sign of this is usually the acid inside the battery boiling causing the battery to swell. You may also smell a bit of smoke due to things potentially getting too hot. In other cases it may result in the alternator not supplying enough power to the battery, resulting in undercharging the battery or not charging it at all. I would recommend having an expert from YourMechanic come to your location to diagnose your vehicle’s charging system.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. The "service battery charging system" light is on but the voltage gauge is reading over 14 volts

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: My Dodge Avenger is running hot intermittently. New thermostate, coolant has been flushed for air pockets.

A scan tool should be applied to measure the actual engine operating temperature. Gauge and/or temperature sensor/sending unit malfunctions have to be ruled out. if the car is in fact overheating, a plugged radiator, a faulty radiator pressure cap, collapsed...

Q: At 60k miles my 2014 Nissan Rogue is needing transmission maintenance, Its sounding like its winding up and the gear shift has loc

The transmission service should definitely be performed based on the age and mileage alone. The CVT transmission life will be greatly extended by maintaining it properly. Not being able to shift it from Park is a separate issue. Modern vehicles...

Q: No start and key stuck in ignition switch?

Hi there. Assuming the vehicle ran when it was parked, would lead me to believe, more than one thing is going on with your vehicle. A half a gallon of fuel, may not be enough to start the engine. If...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...