What was found
LEFT BOTH STARTERS ON AFTER START UP ( FLEW A B MODEL FOR 2 WEEKS AND GOT USED TO THE NON LOCKING TOGGLE SWITCH), COUPLE MINUTES AFTER TAKE OFF I NOTICED THE GENERATOR FAIL. TOLD SLC I WAS RETURNING AND LOST POWER. MADE THE DECISION TO FLY INTO KPVU. MADE ATTEMPTS TO CALL SLC AND PVU TOWER BUT I HAD INSUFFICIENT SERVICE. WHILE DOING SO I RAN GEN INOP CHECKLIST, CHECKED BREAKERS, AND DID THE E GEAR EXTENSION. I WAS TEXTING THE FAA AND HAD PVU TOWER VERIFY MY GEAR WAS DOWN. LANDED AT PVU, TAXIED TO THE ALPINE HANGAR, AND CALLED SLC TRACON.