We just ran some #4 AGW wire from one of the trucks batts to the rear bumper, 2 quik disconnect welding connectors and have 12 vdc @ 160 amps with the truck running, good for winches , jumper cables , major spot lite or what ever DC stuff you want to fool with, been there for 10 years comes in real handy , got a blue sea systems 250 amp breaker near the batt