I have looked at those, the SD-20 as well. But they are an alternator and require something to excite the windings. That's why I am thinking of a generator. So regardless of what's going on with any myriad of electrical system malfunctions, it can always be counted on to start making power.
The Corvair guys use these: http://www.n56ml.com/corvair/dynamo.html
Available here: http://www.amazon.com/Alternator-Permanent-Magnet-Deere-Tractor/dp/B007RCX0LK
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