The following information is derived from the FAA's Service Difficulty Reports and Aviation Maintenance Alerts.

Beech C33A Debonair Shorted Voltage Regulator Overvoltage warning light illuminated. Installed a new voltage regulator (p/n R1530b), started engine, switched on electrical system, warning light came on. After troubleshooting with manufacturer’s support, unit shorted internally. Manufacturer blamed faulty alternator and would not honor warranty. Unit will not work with this system no matter what manufacturer […]
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