What was found
WHILE CREW WAS WAITING AT THE END OF THE RUNWAY FOR CLEARANCE TO TAKE OFF, THE STANDBY POWER LIGHT AND GENERATOR OFF LIGHTS CAME ON. SHORTLY AFTER THOSE LIGHTS CAME ON THE CREW ALSO NOTED A STRONG ELECTRICAL BURNING SMELL. CREW ELECTED TO RETURN TO PARKING RAMP AND THEN CONTACTED FLIGHT FOLLOWING AND WAS TRANSFERRED TO MX CONTROL. ANOTHER ACFT AND CREW WAS DISPATCHED WITH MECHANIC, MANUALS AND PARTS TO REPAIR ACFT. MX TROUBLESHOOTING - FOUND STARTER GENERATOR BAD, R & R STARTER GENERATOR WITH SERVICEABLE UNIT - COMPLETED ACFT INSP AND ENGINE OP RUNS IAW MM 80-00-00. NO FURTHER DEFECTS NOTED OR FOUND.