Q: Car keeps dying while i drive. I have a brand new battery and just replaced the alternator a week ago. Dies when headlights are on

asked by on

Car keeps dying while I drive. I have a brand new battery and just replaced the alternator a week ago. Battery light stays on like there is an error. Only seems to die when I turn my headlights at night. ABS light will turn on and then all my gauges will stop working and then the car will shut off.
My car has a manual transmission.

Although the alternator is new, and presumably working properly, charging system output should still be measured at the battery terminals. You want to rule out a problem in the charging circuit and/or connections to the battery. If charging system output is normal, the amount of current drawn by major circuits running off the battery should be measured. It is possible there is a high resistance somewhere, a bad ground, or a "phantom" electrical load that is not supposed to be there and that can cause a voltage drop, possibly explaining the issue your car is experiencing. To have all the appropriate diagnostic tests performed, the service to request is an electrical circuit/component diagnostic. If you request that, the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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. Car keeps dying while i drive. I have a brand new battery and just replaced the alternator a week ago. Dies when headlights are on

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: Q: Engine idle fluctuates

There are a couple of reasons your engine idle may run high such as a vacuum leak or a dirty or faulty idle air control valve. The idle air control valve reads the air intake as it is mixed with...

Q: I have a 2001 ford expedition 4.6 motor. Will a 2004 crown vic 4.6 motor work? If so how.

Claimed by Andrew Quinn

Q: Q: Car starting up but won't stay running

If the car is starting with no issue but the problem is immediate stalling typical causes for such immediate stalling are a faulty mass airflow sensor, faulty engine coolant temperature switch/sensor (typically at cold start only), faulty camshaft or crankshaft...

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...
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.