TM  5-5420-226-20-1 TM  5-5420-226-20 Symptom-1 DETAILED TROUBLESHOOTING PROCEDURE VEHICLE OPERATION -   POWERPLANT, STARTING FROM STEP (Continued) o¹⁰ I Check    bulkhead engine    disconnect harness (CKT    14) at   engine disconnect for   electrical power. \ Second Techniciisn (Rear Grille Doors) l   Reconnect    both    tmnsmission harness connectors (CKT 14)   to   neutral shift    switch connectors. First Technician (Operator’s Station) l   Set    MASTER BATTERY switch OFF. Second Technician (Top Deck) l   Open   left   top   deck    grille    doors. l   Disconnect bulkhead engine disconnect harness connector (CKT 14)   from    engine electrical harness connector at   engine disconnect, l   Connect    red   probe    of  meter   to   contact    M   (CKT 14)  of bulkhead engine disconnect harness connector and black probe to   ground. First Technician (Operator’s Station) l   Set    MASTER BATTERY switch ON, l   Press    and    release   starter switch, Second Technician (Top Deck) l   Check   if  meter   indicates 18  to   30  volts   dc   when    starter switch is  pressed, Does    meter indicate 18  to   30   volts    dc? 1 n 1⁺ o II TO  VEHICLE GROUND n oh OJ ~o Q 0“ OL ON T IQ³⁶_{Checkengineelectricalharness} (CKT    14)  for   continuity from connector at   engine disconnect to   connector at   transmission disconnect. TAI06797 4-108