What was found
AIR TURN BACK. ON DEPARTURE DURING CLIMB, THE NR 1 ACW GEN FAULTED. THE QRH WAS CONSULTED & THE CREW ELECTED TO RETURN. NO EMER WAS DECLARED. THE ACFT LANDED WITHOUT INCIDENT. DUE TO ICING CONDITIONS ENROUTE THE ACW GEN WAS NOT DEFERRABLE. AFTER EXTENSIVE TROUBLESHOOTING, MX FOUND A CHAFED WIRE IN THE NR 1 ACW GEN HARNESS. THE WIRE WAS REPAIRED, OPERATIONS CHECKED GOOD & ACFT WAS RETURNED TO SERVICE.