Skip the auto shop - Our mechanics make house calls

Q: Car has a little trouble starting but starts. While driving sometimes the lights will dim or my radio will cut off then back on.

asked by on

I have tested the battery and alternator and both test fine.

Make sure you have good battery cables and battery terminals as well. Check for any fine cracks on the terminals, which can lead to a loose connection. A faulted sensor like a coolant sensor or air temperature sensor can offer false readings to the ECU and in turn the ECU will send the wrong air-fuel mixture to the engine causing it to start hard or run poorly.

Newer vehicles have a voltage regulator that is integral to the alternator assembly. If the voltage problem is affecting the whole car, this may be the problem. To have all these items checked, I recommend enlisting the help of a qualified mechanic that can inspect the hard start, pinpoint any faults, and perform any repairs that may be needed.

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. Car has a little trouble starting but starts. While driving sometimes the lights will dim or my radio will cut off then back 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: How do I turn on RDBS radio?

The radio in your truck has a mode on the RDBS radio that will allow you to search for music and stations based off music genres. This can be a handy way to find new music. To turn the RDBS...

Q: Dashboard has electrical problem.

Hello, Electric concerns on cars can be an intimidating challenge to take without the proper training and tools. Though the information provided here is limited, it seems that your Ford Explorer is experiencing issues with either the digital display or...

Q: Car won't crank when it's cold and now won't start at all

Hi there: Usually this issue is cased by low cranking amps inside the battery. If you've recently had the battery replaced, it's possible that an electrical component that makes up the charging system might be damaged or faulty. It's also...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.