so it should be more like a big 5 lol
0g from alt positive to junction box and then from junction box to batt positive?
Well the short wire between the battery and junction box is already 4 AWG so it's not much of a bottle neck. The big issue is the main wire between the alternator and junction box. It's like 6 AWG then splits into two 10 AWG wires where the splice is for the green signal wire.
--Joe