What was found
AIRCRAFT WAS GROUNDED: ON TAKEOFF ROLL AT 120 KTS THE LEFT GENERATOR FAILED. WE TOOK OFF AND STARTED THE APU AND COMPLETED QRH CHECKLIST AND PUT LEFT GENERATOR ON THE APU. AIRCRAFT RETURNED TO FIELD, LANDED OVERWEIGHT WITHOUT INCIDENT. MAINTENANCE FOUND HIGH RESISTANCE WAS FOUND ON WIRING BETWEEN LH GCU AND FIRE HANDLE, REFWDM 24-22-11 SHT 2, D40428P AND D576. MIA AVX FOUND D42276P, ON J72, AT POS 17, NOT SECURED. CONNECTOR HAS BEEN INSPECTED, REINSPECTED, AND RESECURED. THE WIRING FROM THE GCU THRU THIS CONNECTOR TO THE FIRE HANDLE SWITCH AND BACK TO THE GCU CHECKS GOOD.