I am in the process of doing a big three upgrade on my D.D'er a 1994 Astro.

What the big three consists of is a battery with a side mount terminals that is connected to the normal wire harness and then larger cables connected to the top terminals,one for the ground,one from the alt to the battery,and one from the engine to the frame.

Yrs ago I read a article that stated unless the cable size was increased,it wasn't worth doing.

So for the battery to a ground on the frame I went with 0/1 cable and the same size I am going to use for the frame to the engine.The Alt to battery I had to limit the cable size to number 2 cable because the only cable terminal that would fit on the Alt is the number 2.In doing that I am improving the charging cable size.

My question is because of the different size cables from the Alt to the ground wires,am I creating a electrical imbalance??.