What was found
DURING REVENUE FLIGHT, PILOT EXPERIENCED GEN FAILURE LIGHT. AFTER VERIFYING SYS WAS INOPERATIVE BY CYCLING GEN SWITCH FROM ON TO OFF, TO ON & NO CHANGE. THEN CHECKED BATTERY LEVEL, ENOUGH VOLTAGE EXISTED TO MAKE THE LAST FEW MINUTES TO THE INTENDED LOCATION WITHOUT HAVING TO USE ALTERNATE, POSSIBLY LESS SAFE LOCATION. NORMAL LANDING WITH WEAK BATTERY & SOME COMMUNICATIONS & LIGHTS STARTING TO FAIL. ACFT WAS LANDED AT DESTINATION WITH NO ISSUES. PATIENT WAS UNLOADED AND MYSELF THE MECHANIC WAS NOTIFIED. ARRIVED & CHANGED THE GEN & STARTER & ACFT BATTERY. ACFT WAS RUN & SYS CHECK. ALL OPERATIONS NORMAL. ACFT WAS FOUND TO BE IN AN AIRWORTHY CONDITION & RETURNED TO REVENUE SERVICE.