TM 10-3930-669-20 16.  FAN(S) DOES NOT OPERATE (CONT) KNOWN INFO Cab lights operate. Wire 36 OK. POSSIBLE PROBLEMS Ground wire 13 faulty. KNOWN INFO Cab lights operate. Fan motor OK. Wire 36 OK. Ground wire 13 OK. POSSIBLE PROBLEMS TEST OPTIONS Continuity test. STE/ICE-R #91. REASON FOR QUESTION If continuity is not present, ground wire 13 is faulty. TEST OPTIONS Verify repair. REASON FOR QUESTION If fans operate, fault has been corrected. 2-216