Maybe the problem will never be solved - but maybe his wife recalls an 'electrical problem with the engine' - that is rough running and engine failure due a problem with the mags (or independently carb ice)?
In common with other Posts I would be surprised if anyone would consider ditching with a total electrical failure.
I once had a total electrical failure in a C172 at night over the North Yorks moors en route from Barton to Teesside (black and bleak). No thought of an emergency landing - just how to resolve the issue and land at the nearest suitable airfield (which was Teesside as it turned out). Easily resolved with the aid of (my) mandatory handheld radio for night flights - and the engine was still turning and burning.
Easy to speculate from the comfort of ones armchair.
KR
FOK
