Here is what you are looking for... should not have 4 wires 3 if spdt 6 if dpdt
http://www.iboats.com/Toggle-Switch-Spdt-On-Off-On-Ancor/dm/cart_id.870898857--session_id.039296700--view_id.931486
Any marine store would be able to get you a a switch... (mom on) off on spdt (single pole double throw) or dpst (double pole double throw)
Just make sure it has a 10 or 15 amp rating
Here is what I use. 2 milk crates notched so auger sits in them properly, mounted on 2x4s with L- brackets screwed to the edge of the 2x4 so I can attach to rack with hose clamps. Pics are not the best but give you a general idea