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Dale:
On my aircraft, the red light is "over voltage", not discharge. If you are getting an overvoltage condtion, it will trip the alternators off line. I would first check the output of each alternator with a voltmeter, one at a time. I would also check the diodes (both the little signal diodes and the large power diodes) on the circuit board on the firewall. This is very easy to do with a volt meter as well. If any of the diodes are bad, you can replace them with identical components from Newark Electronics for a fraction of the price compared to Cessna.
Mark
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Mark Hislop
N37E
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