-. / TM 5-5420  -226-20-1 DETAILED TROUBLESHOOTING PROCEDURE INDICATOR -   LAMP (Continued) Symptom-42 POWERPLANT WARNING LAMP   ON   (ENGINE RUNNING —   ALL   GAGES I This   procedure is  to  be  performed by two persons. The lead person is referred to  as  the  first   technician and shall   direct    the  activity    of  the  second person    called    the   second technician. heck   engine    high  oil  temperature switch   for   short   to ground (engine cold). Second    Technician (Operator’s Station) l   Set   MASTER BATTERY switch OFF. First Technician (Rear of   Crew Compartment) l   Remove    engine   lower   access   cover    (page    17-16). l    Disconnect engine electrical harness connector (CKT 509L) from engine high    oil   temperature switch. l   Set  multimeter to  OHMS XI  scale   and   zero   meter   or  use STE/ICE Test No.    91   (page 4-83). l   Connect    red   probe   of  meter    to  center    contact   of  high   oil temperature switch &d black probe to   ground. l   Check   if  meter   indicates continuity. Does    meter indicate continuity, thereby indicating a short? 1 YHF TO   VEHICLE II ~ GROUND ENGINE HIGH    OIL TEMPERATURE SWITCH CKT 509L ~- 01 FRONT OF    ENGINE (VIEWED THRU LOWER ENGINE ACCESS DOOR) Replace engine high   oil temperature switch (page 10-219). TA10719O -- 4-501