Charlie, wouldn't it be easier and cheaper in the long run to just get a durable HD rectifier p/n 74540-01 off ebay for a few dollars, bolt it directly to the backplate and forget the bobbins? You even live in the land of cheap and plentiful Harley parts. They work great, no problems.
Ditto this. My HD unit has been bolted directly to the backplate for the last 13,000 miles with zero problems. The Cycle-Electric stock unit is supposed to constantly adjust to the load (which I think is where the failures come from) whereas the HD unit just goes full blast and dumps the excess to ground. Not much to go wrong.
