Here are a few pics of my battery /start box. It took me a little longer to get the pics than I hoped but here they are. The solenoid is mounted under the white plastic plate that hoods the terminal bolts. There is a switched 12V+ and a 12V+ always hot, and the (-) terminal. That gives me the option to use it to start motors that are wired to connect to a boat mounted solenoid box as well as just as a battery to start motors with on board electrical.
– Ben