I imagine someone else who visits this site will have the data, but I know Tom Carr (tcarr@cessna.org), the Cessna Pilot's Association specialist for the 337, has a field approval for this that he provides copies of. (I suspect you need to be a CPA member, which I am.) He has installed the parallel regulators and the larger alternators on several 337s. I looked into it, but haven't really had much problem with my electrical system, so I have not gone ahead with it. I actually got a copy of the field approval from him, but I can't for the life of me remember in what highly secure location I filed it.
Kevin
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