running 2 batteries

[timderiksen]

i need to run a second battery in the trunk does anyone know how to and what i need to wire them up

[Broadfield]

Run at least a 4 gauge wire from the front battery to the back battery. It really should be fused at both ends. Then just ground it, using the same gauge wire as the power, to bare metal on the floor of the car. You want the ground to be as short as possible.