Skip the auto shop - Our mechanics make house calls

Q: Changed alternator and battert, light still on and car dieing

asked by on

Changed alternator and battery and light is still on and battery dieing.... what do I do next...which fuses should I check, where is the fuse link and how do I check it? What else could it be?

My car has 200000 miles.
My car has an automatic transmission.

A: This may suggest a bad grounding issue or p...

This may suggest a bad grounding issue or potentially a failing voltage regulator. This is a unit that regulates the charging of the battery by the alternator. Often times this will 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 either case, I would recommend having an expert from YourMechanic come to your location to diagnose and properly test your vehicle's charging system.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Won't start just cranks

Without a good description of the noise, this may be difficult to diagnose through Q&A. If the engine is turning over faster than usual, there may be a problem that caused the engine to lose compression. If the engine cranks...

Q: Clicking sound coming from left front driver side wheel not just turning but going straight increases with speed 2007 dodge grand

Hi There, It sounds like you may have a worn or failing CV joint that. A CV (Constant Velocity) joint is a shaft that connects the transmission to the wheels, essentially transferring the power from the drive train directly to...

Q: Misfire in the 4/5 fuel injectors

Hi there. If the engine code is showing that you're experiencing a fuel injector misfire, it's most likely not related to the fuel pump. Most of the time, this is a fuel injector sensor or connection malfunction that triggers this...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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 Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.