Skip the auto shop - Our mechanics make house calls

Q: Lights

asked by on

When I start my car sometime the lights on radio&dash are dim when this comes on my running lights go right out when I shut off. Now sometime the lights are o k and then when i stop the lights go out in 30 sec.Back about 1 month my light came on but there was no codes I just reset it . Does not seem to be hurting anything. So what do think Thank you Jim

My car has 69000 miles.
My car has an automatic transmission.

Fluctuations in lighting output can be due to a bad alternator, loose alternator drive belt, wiring faults in the lighting circuit including bad grounds and a weak battery. I recommend you have the battery load tested and, at the same time, have the charging system output tested. Normally, at the battery posts, you should see a voltage of about 14.5 volts when the car is running but the exact specification will depend on your Factory Service Manual. 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?

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: Jumpstart won't start car

Hello. Your vehicle may have a failing starter. The power to the starter needs to be checked; there should be 12v at all times on the big wire, and 12v on the little wire only in the Start position. If...

Q: How do I use favorite stations?

The favorite stations feature allows you to save certain radio stations as your favorite, so that they are easy to access. The favorite stations are saved in the favorite pages, which can each hold six favorite stations. To set a...

Q: A/C won't turn off or lower from high

The most common cause of blower motor issues is the blower motor resistor, though usually it will only work on high speed and won't work on any other speeds. Because yours is blowing in high speed in all speed settings,...

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...
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...
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...