TM 10-3930-669-20 17.  HEATER BLOWER DOES NOT OPERATE (CONT). KNOWN INFO 24 vdc circuits operate. Fuse 9 OK. Wire 38 OK. Heater blower switch OK. Blower motor ground wire OK. POSSIBLE PROBLEMS Fan blower motor faulty. KNOWN INFO 24 vdc circuits operate. Fuse 9 OK. Wire 38 OK. Heater blower switch OK. Blower motor ground wire OK. Fan blower motor OK. POSSIBLE PROBLEMS TEST OPTIONS Continuity test. STE/ICE-R #91. REASON FOR QUESTION If continuity is not present, ground wire is faulty.  If ground wire is OK, fan blower motor is faulty. TEST OPTIONS Verify repair. REASON FOR QUESTION If heater blower operates, fault has been corrected. 2-222

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