Note just to the right of the bottom most wire. That wire is connected to the coil, which you can see just to the right of that connection through an opening in the outer box. That is where they label the coils voltage. In this case 12VDC, S&S's 12D, the same as is in my M28 2-group. 
Java "An international machine" phile

Java "An international machine" phile

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