As you have noticed, the starter motor uses a frame ground. Since you have an aftermarket FULLWAVE rectifier, you need to float the ground at the stator. This means that the stator frame ground has to be removed from the stator plate and connected to a new wire. So the rectifier input gets powered by the white wire and your new wire. This isolates the stator.
The rectifier output goes to the battery positive and battery negative. Battery negative is connected to frame ground so the starter motor functions. Keep in mind that your battery positive wiring to your switch gear should be fused for safety. Connect everything to DC so it is easier to understand the wiring.
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2011 EC250E
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