Battery, at most 6ft
pt cruiser
headunit is kenwood kmmbt525hd; grounded on the same bolt as the battery's chassis ground, and ran with 12awg ofc to headunit's wires.
amplifier is rockford 600x4; 0/1 ofc ran to battery posts with d4s 6spot-distro, and 4awg copper reducer at amp
front battery is...