( TM   5-5420-226-20-1 Symptom-39 DETAILED TROUBLESHOOTING PROCEDURE INDICATOR -  GAGE FROM STEP 1 (Continued) o2 I Check FUEL   TANKS selector switch    for   continuity through circuit    that   indicated wrong    (CKT    30  for   left fuel   tank,    CKT   31  for   right   fuel   tank). First Technician (Operator’s StatIon) l   Set   MASTER BATTERY switch OFF. l   Displace    gage    instrument panel    (page 10-111  ). l   Disconnect fuel   tanks selector switch cable (CKT 28) from FUEL TANKS selector switch. l   Set   FUEL    TANKS selector switch to   circuit being checked (L   for   CKT 30,   R   for   CKT 3 1). l   Disconnect gage   instrument panel   harness connector of CKT 30   or   CKT 31   (as   indicated by   fault in Step @ from FUEL TANKS selector switch. l   Set  multimeter to  OHMS X  1 scale   and   “zero” meter,    or use   STE/ICE Test No.    91   (page 4-83). l   Connect red    probe of   meter to   gage   instrument panel harness connector of  circuit disconnected in  above   step. l   Connect black probe of   meter ~o  center connector of FUEL TANKS selector switch. l   Check   if  meter   indicates continuity. Does meter indicate continuity? I CKT R  FUEL 31 .  TANK \ n+ o   I “- T   28 I ,.&2K ( ) Replace FUEL   TANKS selector switch (page 10-1 32). TA107168 4-479 —