TM  5-5420-226-20-1 Symptom-2 DETAILED TROUBLESHOOTING PROCEDURE T VEHICLE OPERATION -  POWERPLANT, STARTING (Continued) -. #Check fire   extinguisher fuei   shutoff switch for continuity (internal short). First Technician (Commander’s Station) l   Install    front   accessory harness connector at buikhead disconnect (page 10-270). # l   Install    engine   upper   access   panei   (page    17-15). Second Technician (Operator’s Station) l l l l Disconnect front accessory harness connectors (CKT 975)    from fire   extinguisher fuel   shutoff switch. Set   multimeter to   OHMS Xl scale    and’’zero” meter, or   use   STE/ICE Test No.    91   (page    4-83). Connect oneprobe of   meter to   each    disconnected fuel   shutoff switch connector. Check if  meter indicates continuity. Didmeter indicate continuity, thereby indicatinga I shorted switch? l   Repiace fire   extinguisher and I^{fuei   shutoffrelay} (page 10-141). I^{l   Connectfront    accessory} harness connectors to   fire extinguisher fuel   shutoff ~ switch. 1’^{Replacefuei   shutoffswitch} (page    20-29). o^NO F TA106836 ... 4-147