Battery Ground

[rocketrod]

The ground in the trunk only can be connected the wheel well in the trunk. You can connect it to the fram rail, but the wheel wells are connected to the floorpans and there is no advantages plus it eliminates the need to drill though the trunk. In addition to the rear gound run one ground from the subframe to the firewall, and then two grounds from your engine to the subframe. Also use the same gauge wire for the + battery and -Gnd connections.