Q: I put in a new battery. Alternator tested fine with meter. What else could it be? Battery light comes on again.

asked by on

Battery tested at 12.6 volts not started. Started it, it tested at 14.30. Running most accessories it went down to 14.20. But my battery light comes on the first 5 minutes it runs and after 15 minutes of running the lights flicker. What else could it be?

My car has 166000 miles.
My car has an automatic transmission.

In order to know if the light is coming on for the alternator you will need to test at the alternator when the engine is at 2,000 rpms to see if voltage goes over 15 volts. If it does then the alternator needs replaced.

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. I put in a new battery. Alternator tested fine with meter. What else could it be? Battery light comes on again.

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: Battery died. Now can't get into my car to pop the hood and charge it.

Hi there. The car could have made the door latches locked out. This prevents the doors from opening during an event of power loss during an accident. This happens, but the mechanical key should still open the doors. If the...

Q: Alarm system won't turn off

If the alarm system will not turn off, and the car will not start, I would first try unlocking the driver side door manually with the key, and if it has a remote, checking to see that the remote's battery...

Q: I was just told that a tensioner or pulley could have caused my alternator to go bad and if not replaced could make the new one go

Pulleys do go bad because the grease in the pulley bearing dries out, the ball bearings and bearing races get pitted and then the pulley becomes noisy. Sometimes, the pulley will actually seize. However, it will be EASILY evident if...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...