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・Save up to 30%

Get a quote

What others are asking

Q: Not shifting out of park to drive

The brake light switch or interlock solenoid are the possible causes of your problem. The brake light switch may be malfunctioning and not turning on the brake lights or disengaging the shift interlock. I suggest having a certified mechanic, such...

Q: Air leaking from air ride suspension

The problem is most likely a bad air strut. They are constructed of rubber and crack and leak over time. If you have a bottle of soapy water solution, you can spray it onto the air struts and when you...

Q: Battery is drained in the morning - 2010 Mercedes-Benz C300

Hello. You have either a faulty battery (a load test on battery can easily determine status of battery), faulty charging system, and/or a substantial phantom load (parasitic power draw) that is discharging the battery while the vehicle is turned off....

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...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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.