4 terminal Switch install

I need help hooking up my 4 terminal switched for some led cubes. It's a four way terminal and I don't know which one goes where. I know one is for ground, one for battery, and one to lights. But what about the fourth? Not really an electrician. Help wanted

 

Are there LEDs on the actual switch that light up? That's what the other 2 poles are for then.

 

Yes there is a blue led infront. How would I wire all that?

 

First thing you do is remember where you bought the switch. Then see if a wiring diagram is included, if it's not, contact the MFG and ask for one. If all else fails, get a volt meter and check continuity between poles with the switch in different positions. That will tell you everything you need to know. You can also jumper the grounds instead of running 2 separate ones (if it calls for 2 grounds).

 

this is the diagram of the exact switch I got

 

I'm at work so the picture doesn't show up. If I remember I will chime back in tonight when I get home.