It could be because its running out of battery
Battery is dead?
If your interior lights are dimming, either your battery or starter could be failing. You should have your car checked.
you drain your battery when you leave your lights on
out of gas prbably
The best way to find out if your headlights are dimming is to turn your lights on when it's dark at your house and check and see. Also you can go to auto zone and ask if the lights in your car are dimming and what you can do to fix them.
there is a short in the relay for the head lights
Car battery is run down.
when i play music in my car the lights dimm i wanted to know if a capacitor would stop that problem
yes but wont run for long, you will have no lights, horn, radio ect.
Take it out of reverse.
Defective alternator or broken alternator belt.
Yes, yes it does. Try thinking like this: If you play at really low volume in your car, and your amp is rated at 2000w, powered with a bad battery, then you won't notice any dimming in the lights, but when you crank it up. Then you get dimming lights.