TM 5-5420-226-20-1 Svmntom-41 DETAILED TROUBLESHOOTING PROCEDURE –. r----- T INDICATOR -   LAMP (Continued) ( m Check   engine    electrical harness (CKT   509L)   at  engine low   oil  pressure switch 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 at   bulkhead disconnect (page 10-270). l   Remove    lower   engine   access   cover   (page    17-16). l   Disconnect engine electrical harness connector (CKT 509L) from engine low   oil   pressure switch. l   Connect    red   probe    of  meter   to  center   contact    of  engine electrical harness connector and   black    probe   to  ground. Second Technician (Operator’s Station) l   Set   MASTER BATTERY switch ON. First Technician (Qmmander’s Station) l   Check   if  meter   indicates 18  to   30   volts    dc. Does    meter indicate 18  to   30   volts    de.? FOR   CLARITY QUADRANT ASSEMBLIES NOT   SHOWN I⁴ I u =—-_   —__ Am o- n + 0 TO   VEHICLE ]) GROUND // E’^{ENGINELOW    OIL} PRESSURE SWITCH -a ---’””=””_w . a —1  . ‘1 I LOWER ENGINE ACCESS PANEL ~Repla.e engine low   oil   pressure I^{switch    (page10-242).} TA107185 4-496