Alright my blazer's lights are normal when just normal driving, but when I floor it my lights get really dim.......

Alternator?

Just got a new battery so thats not the problem.

Edit: 2000 chevy blazer 4door 4x4 (if relevant haha)

 

sounds like it

get it tested at your local auto parts

 

Thats what im suspecting, thanks for the quick reply!

 

NP do it before she leaves ya in the middle of the road

I recently helped someone swap an alternator a few weeks ago in a parking lot