The stock size is 6ga, the recommended upgrade for most purposes is 4ga, the upgrade for extreme mods is 2ga and up.
The stock 6ga is probably fine with no mods like a lift, big tires or high speed or high torque motor.
Cables for mods are dependent on what you do.
What do you have now and what are you trying to accomplish?
I have a 36 volt ezgo that has been lifted and bigger wheels added. It is used mostly around the camp and in the woods.
I have just replaced the stock wires on the batteries with # 2 wires. Will be replacing the rest of the wires on my next trip
to the camp. I was just wondering what is the best size for my application. Not planning on going with a bigger motor anytime soon.
I'm more interested in getting as much torque out of the cart as possible. Some really steep hills where we ride, and so far it has
handled them well.
All the cables carrying power to the motor need to be the same gauge, this includes the ones to the solenoid, F-N-R switch and the motor itself.
For max torque you should consider an upgrade from the stock 275a to at least a 400 amp controller.
Thanks for the input. The cart was bought used and the previous owner had run welding leads for the wires going to the
motor. I just upgraded the battery wires. I normally keep it at my camp, but I only get up there about every 2 weeks. I need to bring it home so that I can upgrade all of the wires and make them all the same. As I posted earlier, the cart was already lifted and bigger tires
added. I will need to determine if it already has the larger controller or not. I appreciate all of the help that members have suggested
on what to do for the forward switch over heating. As soon as I tackle that problem I'll post what I found and what worked.
Again, thanks for the help.