1.   Each cable clamp has a locknut that must be screwed on from inside the box.

2.   Push the power cable through the knockout in the side of the box and anchor it with a cable clamp.

3.   Thread a cable clamp onto each cable, then tighten the clamps with a screwdriver.

4.   When he reconnected the cables to the battery posts, he used a hammer on the cable clamps to help make contact.