Thats the 2K-2 ignition that has only one AC output (yellow). The larger 2K-3 has two(yellow and white). Both are referenced to chassis ground in the stator. You need to float the AC ground in the stator and then ground the neg side of the rectifier (DC ground). I would look at the instructiuons on the Trailtech site for a KTM 250/300 as the ignition is basically the same electrically.
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