When I had the vehicle, stock alternator (2015 Volkswagen Golf R) big 3 upgrade with 0-gauge welding cable Two AGM batteries, 1 front and 1 rear 2-gauge welding cable ran to the back 0-gauge welding cable hooked up between the rear battery and amplifier. 8 gauge welding cable for the subwoofer
What kind of electrical do you have?
When I had the vehicle,
stock alternator (2015 Volkswagen Golf R)
big 3 upgrade with 0-gauge welding cable
Two AGM batteries, 1 front and 1 rear
2-gauge welding cable ran to the back
0-gauge welding cable hooked up between the rear battery and amplifier.
8 gauge welding cable for the subwoofer