I'm trying to connect 2 batteries to that switch. I'm going to use 1 battery for 1, 2 for battery 2, and 2 for Battery All. Please tell me how to connect.
1. Wire as shown below.
1) Connect the -terminal of the two batteries to the -terminal of the load.
2) 1. Connect the + terminal of the battery to each of the 2 terminals.
3) Connect the COMMON terminal to the + terminal of the load.
2. Then, the contacts are connected as indicated on the front of the switch.