The cables that conduct the direct current from the two battery posts to the block for grounding and to the starter to engage the engine draw the biggest current. These wires should be four-gauge. The wire from the positive post to the alternator is usually eight-gauge.
I just wanted to replace the terminal I have a brass connector I wanted to take of the autozone terminal I had to install and replace it and it takes 4 gauge so I think I should be okay.