What was found
GOT MULTIPLE ELECTRICAL PROBLEMS IE. FLASHING LIGHTS INTERMITTENT PFD'S LOSS OF ALL 3 AUTO PILOTS, AUTO THROTTLES ETC. EMERGENCY DECLARED, DUMPED FUEL AND DIVERTED TO HNL. SUPPLEMENTAL DATA UPDATE ACFT LOST AC & DC BUS 3 WHEN THE NO. 3 INTEGRATED DRIVE GENERATOR (IDG) EXPERIENCED AN OVER FREQUENCY CONDITION RESULTING IN ITS AUTOMATIC ISOLATION FROM AC BUS 3. AC BUS 3 REMAINED ISOLATED WHEN THE NO. 3 BUS TIE BREAKER DID NOT CLOSE AUTOMATICALLY LEAVING NO 3 AC & DC BUSES DEAD. CREW WAS SUCCESSFUL IN MANUALLY RESTORING POWER TO BUS USING ESTABLISHED PROCEDURE.. CAUSE OF PROBLEM WAS FOUND TO BE CHAFED ENGINE HARNESS WIRING. IDG "EXCITER" WIRING INTERMITTENTLY SHORTING TO AN ADJACENT SUPPORT BRACKET, CAUSING I