Upgrading Controller What Else to Upgrade

[Wahoouva2]

I just recently bought a 97 EZGO TXT with a lift and a speed motor. It needed a new controller and went up to the Alltrax AXE 4855. After getting this mounted and getting the new sulinoid mounted onto it, I was wondering what wires I should be looking to replace on the cart.

It is currently a 36V but when I replace the batteries, I am considering going up to a 48V. The sulinoid is both 36 and 48, so I should be good there, but I read a lot about replacing the wires with heavier gauge.

Can someone let me know what wires I should be looking to upgrade? There are a lot of wires, and for someone new to this, I am a little overwhelmed with what wires I should be looking to replace so they don't get too hot.

Thank You