Skip the auto shop - Our mechanics make house calls

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?

A: Hello there. It is very possible. A chargin...

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 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: Can you drive a car that had the ARP head studs honed and the val

Hi there: Let's simplify some of the things he's suggesting. If he broke a connecting rod on his 1.6 liter engine, that probably caused a lot of internal engine damage to occur. Installing new pistons, piston rings, oil pan gaskets...

Q: Car turns but doesn't crank

There are many things that can cause a no start condition. If your timing belt broke, for example the engine on your vehicle is an interference engine, meaning it hits itself internally when the timing belt breaks. This usually bends...

Q: Car overheating, rough idle, hard to start, coolant does not circulate.

Hi There, It sounds like you may have two separate issues going on here that may possibly be related via the coolant temperature sensor, which is what relays the temperature of the coolant back to the ECU which then controls...

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...
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.