TM   5-5420-226-20-1 Symptom-34 DETAILED TROUBLESHOOTING PROCEDURE FROM STEP INDICATOR -  GAGE o⁹ (Continued) i 1 Check bulkhead engine disconnect harness (CKT 321)    for   continuity from    connector at   engine disconnect to   connector at   buikhead disconnect. Second Technician (Operator’s Station) l   Set    MASTER BATTERY switch OFF. Second Technician (Top Deck) l   Disconnect bulkhead engine disconnect harness connector (CKT 321)    from engine disconnect. l   Connect    jumper wire    from contact D   (CKT 321)   of bulkhead engine disconnect harness connector to ground. First Technician (Commander’s Station) l   Set   muitimeter to   OHMS Xl scale and “zero” meter, or   use   STE/ICE Test No. 91   (page 4-83). l   Connect red    probe of   meter to   contact D   (CKT 321) of   buikhead engine disconnect harness connector at bulkhead disconnect and black probe to   ground. - ,- ,+ w - -@ Qy m. 9 l9 l. -. .- \ ml -8- TO   VEHICLE \~ GROUND \ -\   I \/ “1.L. DI CONTACT (CK:321) .10 lJ  lA H*    l.    % lN   lL % lM lC l E  l0 )D FOR    CLARITY QUADRANT ASSEMBLIES NOT    SHOWN TA107139 4-450