TM 9-2320-302-20 0010 00-18 Table 1. Electrical System Troubleshooting Procedures - Continued. MALFUNCTION TEST OR INSPECTION CORRECTIVE ACTION Standard Heater Circuits - Continued Heater  Fan  Does  Not  Operate  at  Any  Speed  - Continued. 4.    Remove    start/auxiliary    15A fuse.  Check  for  +12  VDC  at lead 71A fuse connector. If +12 VDC is present, go to step 5. If voltage is not present, repair lead 71A (WP 0119 00). 5.    Disconnect  heater  fan  power relay  from  connector.  Check for +12 VDC at connector 30. If +12 VDC is present, go to step 6. If voltage is not present, repair lead 98 (WP 0119 00). 6.    Disconnect    heater    fan    high relay  from  connector.  Check for +12 VDC at connector 87. If +12 VDC is present, go to step 7. If voltage is not present, repair lead 98 (WP 0119 00). 7.    Check  for  continuity  between connector  86  and  ground  for both relays. If  continuity  is  indicated,  go  to step 8. If continuity is not indicated, repair ground lead (WP 0119 00). 8.    Disconnect  heater  fan  power relay  from  connector.  Check for +12 VDC at connector 85. If +12 VDC is present, go to step 9. If voltage is not present, repair lead 71A (WP 0119 00). 9.    Disconnect lead 98 from heater  fan  control.  Check  for +12 VDC at lead 98. If +12 VDC is present, go to step 10.    If    voltage    is    not    present, disconnect heater fan power relay. Check for continuity in lead 98. If continuity    is    indicated,    replace heater fan power relay (WP 0071 00). If continuity is not indicated, repair lead 98 (WP 0119 00). 10. Disconnect    lead    98L    from heater  fan  control.  Check  for +12 VDC at heater fan control connector (D) with heater fan control in high mode. If +12 VDC is present, go to step 11.    If    voltage    is    not    present, replace   heater   fan   control   (WP 0067 00). 11. Disconnect    heater    fan    high relay  from  connector.  Check for +12 VDC at connector 85 with heater fan control in high mode. If +12 VDC is present, go to step 12. If voltage is not present, repair lead 98L (WP 0119 00). 12. Disconnect    lead    98T    from heater   fan   motor.   Check   for +12   VDC   at   lead   98T   with heater    fan    control    in    high mode. If +12 VDC is present, go to step 13.    If    voltage    is    not    present, disconnect  heater  fan  high  relay from connector. Check for continuity   in   lead   98T   between connector 30 and heater fan motor. If continuity is indicated, replace heater  fan  high  relay  (WP 0071 00). If continuity is not indi- cated, repair lead 98T (WP 0119 00).