Thinking of relocating the battery to the trunk to clean things up a bit possibly.
I have a thick gauge wire ran to the trunk already for my stereo amp. Would it be possible to put that into a splitter and then connect to both the amp AND the battery in the trunk?

 

ran 0 gauge for a friend's battery relocation but depends what you have currently.
i use this chart from crutchfield to determine correct size sometimes.