( (^,A TM 5-5420-226-20-1 Symptom-66 DETAILED TROUBLESHOOTING PROCEDURE ZNOTE SUPPORT SYSTEM -   vEHICLE LIGHTING FOR c~RITY QUADRANT If   the    problem is   with    the    left    side service lamp check the left side intermediate connectors. if  the  prob- lem is   with the right side service lamp, check the right side intermediate connectors. (Continued) ASSEMBLIES NOT   SHOWN =front accessory harness (CKT    17)   at intermediate connector for   electrical power. First Technician (Operator’s Station) l   Set   MASTER BATTERY switch OFF. Second Technician (Front of   Vehicle) l   Install    headlight assembly (page 10-172). Second Technician (Front of   Crew Compartment) l   Disconnect intermediate connector (CKT 17)   of front accessory harness from dual headlight base harness connector of   bad    service lamp. l   Connect red    probe of   meter to   front accessory harness connector (CKT 17)   of   bad    service iamp and    black probe to   ground. First Technician (Operator’s Station) l   Set   MASTER BATTERY switch ON. Second Technician (Front of   Crew Compartment) l   Check   if  meter   indicates 18  to   30   voits    dc. -. O:@: ‘ .% J -. >- n 6 0 II Ii TO   VEHiCLE II * GROUND CIRCUIT 17 K ,/ iNTERMEDIATE ~ CONNECTORS A (LEFT   SiDE   SHOWN) Does    meter Indicate 18  to   30   voits    dc? - Repair    duai   headlight base harness (page 10-298). F l   Inspect    front    accessory harness for   bent/broken connector contacts or   loose CKT    17  wire   at   rear   of connectors. l   Repair   connectors if defective. l   if  connectors are   not defective, notify    support maintenance of   a  defective front    accessory harness. l   Connect front    acceaaoW harness intermediate connector. -. TA10734O 4-651