Skip the auto shop - Our mechanics make house calls

Q: Charging system

asked by on

My car battery is less than a year old. When Battery is jumped, all lights come on but car still won't start. Alternator is also less than a year old. Battery? Starter?

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

Hi There, It sounds like you may have a bad voltage regulator that may be causing the alternator to fail to properly charge the battery. The voltage regulator is a unit that regulates the charging of the battery by the 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. A common sign of this is usually the acid inside the battery boiling causing the battery to swell. 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. I would recommend having an expert from YourMechanic come to your location to diagnose 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
  1. Home
  2. Questions
  3. Charging system

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: Where the driver's shaft thing that spins is slinging oil when I drive, but if doesn't leak when my car is parked

You don't mention which end of the driveshaft is leaking oil, but in either case, the problem would be worn bushings or bearings that allows the driveshaft to "wobble" enough that the oil seal is leaking (the oil seal is...

Q: I set an appointment for 1 of your mechanics to come. He's charging me over $300 for a part I can buy brand new part myself for $

Hi Tomi. I've forwarded your question to our sales and service department, so they can better answer your question. They should be contacting you via email shortly. Thanks.

Q: Transmission

For this 2004 year Mercury Mountaineer they were only equipped with a 5R55S transmission for the 4.0 and 4.6 liter motors. The only different transmissions would be for rear wheel drive or all wheel drive. They are both 5R55S base...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.