variable speed motor wiring

[disdude]

I have a varible speed trolling motor that has not markings on it. I need to wire this to a control switch and need help figuring out the wiring. There are 4 wires. Red, Black, Green, and blue/white. This is a 12 volt motor. how would i get the variable speed to work? I can get it to go 1 speed by connecting the black and red wires to a car battery. But the other two wires stump me.

 

[imok2]

Try looking here under trolling motors:

http://mikesreelrepair.com/schematics/index.php