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Your battery is weak, or your your alternator is not charging battery.

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Q: What causes headlights to dim while driving?
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Related questions

What would cause your headlights and dash lights to dim or shut down while driving my 2006 F150 Supercrew?

your alternator is going bad


What causes the headlights to dim in a 2005 trailblazer?

you might have a short in your alternator. In my car the headlights would dim when I put on the brakes or tried to use cigerette lighter to power up my phone.


Power surge with headlights causing them to flash bright to dim while driving on a 86 300 zx?

Remove the alternator and have it tested at any auto parts store?


What causes headlights to dim and flash while driving 96 blazer?

Generally one of two things will cause headlights to dim; a power drain somewhere else (A/C compressor clutch, etc.) or a bad electrical connection. If the dash lights dim at the same time, it's most likely an electrical draw or short circuit. Don't automatically dismiss the A/C clutch because the A/C isn't on; some vehicles also run the A/C in defrost mode to dry the air.


Why are headlights dim in your safari van?

Usually dim headlights are caused by a poor ground connection.


What causes the hi beam lights to be on dim when the low low beam lights are on?

Check the grounds for the headlights.


What causes the dash board lights and head lights to become dim while driving 1998 ford expedition?

could be the alternator is about to go out


Does your 2004 Chevy Impala's odometer and radio dim when you turn on the headlights?

Yes. Far as I know all cars do. They dim for night driving and may not be readable in the day time.


Can the dim headlights burn out while the brights still work?

Yes, if you have dual beam lamps.


When do you dim your headlights?

the courteous time to dim your headlights is as soon as you see another vehicle, or within one half mile.


When should you dim you headlights?

when there are oncoming cars, it is appropriate to dim your headlights when they are about 300ft away. Check your diver manual for the most correct answer.


Why do headlights not dim?

Your headlights may not dim because you don't have dimmer lights. Dimmer lights can blow and leave you with just the high beams.