when sub bumps lights dim

is this a sign of my battery being to small? or alternator
Hard to say with the amount of information you've given us.

List your:

-Rating on current alt.

-# of batteries

- # of amps and amount of power being driven by amps

-Anything else that may induce strain on your cars electrical

If all you have is a bone stock electrical and your having dimming issues, look into the big 3 (wiring upgrade) and maybe even a new battery upfront.

 
where do i get the big 3 from
BAHAHAHAHAHAHAHAHAHA!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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