Not Sure What Size Cables to Order? 
We usually recommend the 2ga set to most customers. It’s an upgrade from stock size (4ga) and works great for bigger alternator, lights and winch - the standard upgrades.

If you’re looking for stock replacement to get your electrical issues back to normal we recommend a 4ga set. The 4ga size is still usually a little bigger and more robust than what your vehicle came with from the factory.

We recommend 1/0 for bigger setups and upgrades like an under hood welder or huge stereo system. It definitely doesn’t hurt to go with the 1/0 but for a lot of people it’s more than what they might need.