Q: Car drove fine until headlights turned on

asked by on

I just replaced my battery in my car. It was driving smoothly until I turned my headlights on. The car then started to lose power. Is it an issue with my alternator?

Hello there. It is very possible. A charging test will need to be completed on the alternator. If the alternator passes the charging test, then the wiring connections both at the positive and ground side of the battery need to be inspected. Areas where the insulation looks melted or the cable feels hot (do not physically touch cable hotspots as burns or injury can occur) may indicate loose or contaminated connections. You may want to enlist the help of a mechanic, such as one from YourMechanic, to diagnose the charging problems and loss of power your vehicle is encountering.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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. Car drove fine until headlights turned 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: Ignition Key switch install to a honda v twin 1818ho.h.c.motor

You could wire it to a relay to only engage power for the starting circuit when the key is on. Wire the key switch to the control side of the relay, and the starting circuit (pedal switch) to the other...

Q: how much it is going to cost me to repair toyota corolla repair ?

Hi...To obtain an exact quote for the alternator, please click on "Get a Quote" at YourMechanic's alternator replacement service page. Once you accept the quote, a certified Mechanic, dispatched by YourMechanic right to your location, will perform this repair promptly...

Q: jacking between changing gears

Hi there: There are multiple issues that could cause the hard shifting issues ranging from linkage issues to internal transmission problems with the 2008 Honda Civic. The fuel economy problems may not be related, but to be certain, you should...

Related articles

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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.