Skip the auto shop - Our mechanics make house calls

Q: Car battery light on... New battery and alternator but keeps dying

asked by on

Hello i have 2001 ford expedition. The battery light started flickering suddenly then it went dead. I got the battery tested at autozone the told me it was bad. I purchased a new one. Then i cranked the truck again it came on and the light was on but no longer blinking. Just on. After an hour of driving my truck went dead again. I then was tolf that my alternator was bad. So i purchased a used one at the junk yard. Aaa came out and tested every thing and said both my battery and alternator were fine but my dropped dead again. Can you please tell me what is making my vehicle die?

My car has 194000 miles.
My car has an automatic transmission.

A: Hello. If your charge indicator is on, this...

Hello. If your charge indicator is on, this indicates a problem in the system. The charge indicator will have a resistor that is about 390 ohms when tested and if it is bad then may cause light to come on. You are having a possible charge problem with alternator. A junk yard alternator may be bad and you would not know it until it is installed. You should have the complete charging system diagnosed by a qualified mechanic that will be able to go over the entire circuit.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Fuel system needs flushing.

This is very possible, depending on the length of time the vehicle has sat the fuel can varnish and become not able to to ignite sufficiently. Flushing the system of old fuel and putting fresh fuel in would be recommended...

Q: Starting problems - 2001 Ford Expedition

Hey there. You should have the fuel pressure checked to see if the pressure does not drop after you turn off the vehicle. If it does, then have the pressure regulator replaced for not holding pressure. If the pressure holds...

Q: My battery's dead and somebody is giving me a jump and it's not working

When jump starting your battery, you need to ensure that you have good metal to metal contact on both ends of the jumper cables. It could also be that your battery is toast. I recommend removing your battery and having...

Related articles

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...
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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...