Here are a few options for wiring your fridge to your car battery.
Dual-battery-system-3nd-ed.jpg?t=1242813107
single-battery-2nd-ed.jpg?t=1242813440
Redarc-fuse-size.jpg?t=1242813651
Fridge-wire-with-anderson-c.jpg?t=1242813855
WIRING OPTIONS