The Stovebolt Site Forums The Shop Area The Electrical Bay 1939 headlight switch

I'm wiring my 1939 truck using what I believe is the original headlight switch. None of the original wiring was left as an example. I'm puzzled by how and what the switch does. It appears to have 5 positions. best guess...1. off 2. possible accessories? 3 taillight parking and dash 4 head light 5 taillight again? very confusing. Also, what is the resister? on the back. Any help about how it works and what goes where appreciated.