Cessna 402/402C/B379 Businessliner/Utiliner
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Aircraft Equipment Problem Critical
Flight Crew Returned To Departure Airport
Aircraft
Left Alt light illuminated nearing top of climb; load share was normal. After 5 mins left load dropped to 0. Shortly after Right Alt light illuminated and the right load dropped to 0. The Low Volts annunciation illuminated. We elected to return to ZZZ in VMC conditions. We ran the QRH Dual Alternator checklist and determined to return to the airport with no alternators. We executed a VFR pattern and landing into ZZZ.
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C402 flight crew reported alternator failure and returned to departure airport.