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Bolens 1254 NO Spark :o(

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Hello all, I finally got my wisconsin TDA 12-D motor in my Bolens tractor I am rebuliding ,But I have no spark ....the ignition module appears to be a CDI unit with three charging legs , (no points ) with one wire leading from it to an automotive type coil ,the wire is hooked to the posative side of the coil,then the negative lug has a wire going to the ignition switch .....(to ground the module or to kill the spark ????? Anyhow I am dumfounded,this engine had great spark until I decided to rebuild it ,and I already have more money into it than I think it is worth .... I guess I need a good wiring diagram for this 1254 ,if anyone has one I sure would appreciate it .... Thanks Jim

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