What was found
ACFT DEPARTED, AFTER SHORT VECTOR TO FINAL, CAPTAIN CALLED FOR GEAR DOWN AND NO INDICATION OF EXTENSION OCCURRED. CREW REQUESTED VECTOR TO SAFE AREA TO ASCERTAIN & DIAGNOSE PROBLEM. AFTER SERVERAL ATTEMPTS TO CYCLE GEAR, THE LOWERED GEAR USING " ALTERNATE GEAR EXTENSION" CHECKLIST AND LOWERED GEAR. AFTER LOW APPROACH & VERIFICATION BY TOWER OF GEARDOWN, CREW DECLARED EMERGENCY AND LANDED SAFELY. ANALYSIS FOUND BROKEN WIRE AT RT MAIN GEAR DOWN & LOCK SWITCH. REPAIR COMPLETED. WIRE REPAIRED, ACFT RETURNED TO SERVICE.