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Karl,
On your alternators, be sure it is the alternator that is the problem. Could be the coupling. You have to know if you have the old or new style to check, but there should only be a little motion when you try to move the fan with the engine stopped. If that coupling is loose, it fouls up the whole system. The old style can leave parts in the engine too, so be sure and check it out. Of course, alternator diodes can go out too, but the Ford alternators in Skymasters aren't any more prone to this than other alternators. If both alternators are ok, the problem can be in the setup that balances the alternators. All the contacts in that setup have to be clean so the resistances are correct, otherwise it doesn't work well either. One solution is to change the voltage regulators to the setup used in the Cessna 310 which has a true parallel setup. Tom Carr at CPA has a copy of the 337 form for this conversion. He should be able to help you if you are a CPA member.
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