Q: Will they test the alternator to make sure it needs to be replaced?

asked by on

The battery light came on, yet no issues with power, etc. I stopped to call triple A, because I have a new high amp battery and didn't know if the alternator has stopped charging it. After I had let the car sit for about 15 minutes, the battery light went off. I drove about 25 miles and the battery warning light came back on. There looks like corrosion on the outside of the alternator, and triple A tested the system, as well as running a diagnostic computer test, and everything looked fine. Of course the battery light wasn't on when it was checked. As I said, there were no power issues for the 25 miles I drove with the warning light on, but it has a new strong cranking amps battery...

My car has 145000 miles.
My car has an automatic transmission.

Hi There, It sounds like you may potentially have a faulty voltage regulator or 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. 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. In some cases when a battery is too weak or damaged, it may no longer hold a charge for any length of time, in which case the alternator may be doing its job, but the battery is just simply too weak to hold a charge. In either case, 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. Will they test the alternator to make sure it needs to be replaced?

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 car keeps blowing oil sending units

Hi there - I suspect you have a blown head gasket. Having coolant in the oil is a classic blown head gasket symptom, and having very high oil pressure means combustion pressure is being leaked into the oil passages. This...

Q: How to remove ignition lock cylinder housing

Hi there. There are two resources I can offer you. First, you might want to read this article on how to replace an ignition lock cylinder. Second, although this video is for a 2003 Honda Odyssey, the process is virtually...

Q: What should I do before I start the engine and begin driving?

All drivers should go through a series of checks before they start the engine and hit the road. These will help you avoid potential injuries and accidents, and enhance both your safety and that of others on the road. ...

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...