TM   5-5420-226-20-1 Symptom-17 DETAILED TROUBLESHOOTING PROCEDURE T VEHICLE OPERATION -  POWERPLANT, STOPPING (Continued) Check bulkhead engine disconnect harness (CKT 54A)   at   engine disconnect for   electrical power. Second Technician (Operator’s Station) l   Set   MASTER BATTERY switch OFF. First Technician (Commander’s Station) l   Install    front   accessory harness connector to   bulkhead disconnect (page 10-270). First Technician (Left Top Deck Grille Doors) l   Open    left   top   deck   grille    doors    to   gain   access    to  engine disconnect, l   Disconnect bulkhead engine disconnect harness (CKT 54A)   from    engine    disconnect. l   Connect    red   probe   of  meter   to  contac~    B  (CKT    54A)   of bulkhead engine disconnect harness connector and black probe to   ground. Second Technician (Operator’s Station) l   Set   MASTER BATTERY switch ON. l   Momentarily set   ENGINE FUEL SHUT OFF switch in   up   position, then release it. First Technician (Left Top Deck) WHw B ENGINE DISCONNECTS (CKT    54A) FOR   CLARITY QUADRANT ASSEMBLIES NOT   SHOWN TA106997 4-308