TM 5-5420-226-20-1 Symptom-41 DETAILED TROUBLESHOOTING PROCEDURE T INDICATOR -   LAMP (Continued) ~Check engine accessory control hanress (CKT   509L) at   engine disconnect for   electrical power. First Technician (Rear of   Crew Compartment) l   Reconnect engine electrical harness connector (CKT 509L) to   engine low   oil   pressure switch. Second Technician (Operator’s Station) l First l l l Set   MASTER BATTERY switch OFF. Technician (Left Top Deck Grille Doors) Open left   top   deck    grille    doors. Disconnect bulkhead engine disconnect harness connector (CKT 509L) at   engine disconnect. Connect red  probe   of  meter    to  contact N  (CKT 509L)   of bulkhead engine disconnect harness connector and black probe to   ground. Second Technician (Operator’s Station) l   Set   MASTER BATTERY switch ON. First Technician (Left Top Deck Grille Doors) l   Check    if  meter   indicates 18  to   30   volts    dc? Does    meter indicate 18  to   30   voits    dc? I ‘o l l l inspect buikhead engine disconnect harness for   bent/ broken connector contacts or loose   CKT   509L   wire   at  rear   of connectors. Repair   connectors if  defective (page 10-298). if  connectors are   not defective, notify support maintenance of   a  defective buikhead engine disconnect harness. Connect bulkhead engine disconnect harness connector at   engine disconnect. %’%F x f’ -; coNTACT N 7 v ‘- (CKT   509L) ENGINE DISCONNECTS $ FOR   CLARITY C?UANDRANT ASSEMBLIES NOT   SHOWN ~ Repair engine electrical harness (CKT    509L)    (page 10-298). CKT EtuLKiiEAi3 ENGINE DISCONNECT N DISCONNECT . CONTACT + TA107186 ..-. 4-497