Thick Gauge Power Cable Install
The Mazda3 is a great vehicle to run a thick gauge power cable through. There is easy access everywhere and most spaces have a lot of room. The rubber boot in the firewall is a little tricky to cut through but that really is the extent of the challenge. Below is a guide to running a thick gauge power cable through a 2004 Mazda3 hatch (sedan would be very similar).
Overview of cable locations in engine bay
Cable run from battery terminal through battery box.
Where the power cable passes through the firewall from the engine bay.
Overview of power cable run through interior of car
Where the cable passes through the firewall into the interior of the car.
The cable after it has been installed (interior of car).
Where the power cable passes the back seat and enters the boot (left hand side of car)