Quote:
Originally Posted by MD83driver
I have been thinking about why there would be so much trouble with these alternator lights if both regulators are set to the same voltage, either 27.7 or 28.8 volts. One possible area for this is since these are not paralleled in real time by the regulators, there is potential voltage drop from the rear to the front, thereby the incoming voltage from the rear would then be less that from the front. Just spitballing.
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You hit the nail on the head. You can install my 400-Series voltage regulator upgrade, and in all cases so far, the flashing alternator lights stay dark. Adding true paralleling alternators equalizes the load between front and rear.
I'm not clear what Cessna engineers were thinking when they designed the Skymaster's voltage regulation system, but it may have to do with the fact that the engineers at Pawnee (Cessna's single engine factory) had never built a twin before (and would never build another).