theres not much too them, a marine style rotates to kind of lock in or you can get the arb style that kind of screws in. alternatively you could wire with anderson plugs. mine was just whatever brand marine style receiver they sold at the auto parts store, and so far a few years and lots of offroading haven't knocked the plug loose.
run new wire for a dedicated always-on outlet, don't re-use the existing plug/wiring