The issue is a split system, part of the bike is AC, part of the bike is DC. With a full wave rectifier like the Trailtech unit, the input and output cannot share a ground.
Note that the GG stator is already grounded so the rectifier output must be kept floating (isolated from ground). The easy way is to have the rectifier DC output only connected to your fan circuit.
For a DC system that is grounded, the GG stator needs to have the stator wiring modified so that one side of the windings is disconnected from ground. This makes the stator output floating (isolated from ground). It is less work to float (isolate) the DC output thus leaving the stator connections stock.
If your really want a decent electrical output, buy a 3 phase stator and matching rectifier. This will give you high wattage and a grounded DC output.
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2011 EC250E
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