Cessna 402/402C/B379 Businessliner/Utiliner
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Situational Awareness
Aircraft Equipment Problem Critical; Inflight Event / Encounter Weather / Turbulence
Flight Crew Landed in Emergency Condition; Flight Crew Diverted
Aircraft
Left ALT OUT light came on intermittently. After about 5 minutes both L and R ALT OUT lights came on along with LOW VOLT light. [Requested priority handling] and diverted to ZZZ. Landing normal. Taxied to the gate.
C402 pilot reported a dual alternator failure during climb resulting in a diversion to an alternate airport.