TM  5-5420-226-20-1 Symptom-1 DETAILED TROUBLESHOOTING PROCEDURE VEHICLE OPERATION -   POWERPLANT, STARTING (Continued) ~ WARNING — Use  extreme care   when   working    with circuit 14A. This circuit carries battery voltage at  all   times    whether MASTER BATTERY switch is  ON   or OFF. I ‘Check engine    electrical harness (CKT   14A)   at  starter low   voltage protection relay   for   electrical power. First Technician (Left Side   of   Engine) l   Set  multimeter to  measure 18 to  30  volts   dc,  or  use STE/ICE Test No. 89  (page 4-81). l   Connect    red   probe   of  meter   to  contact    B  (CKT    14A)  of engine    electrical harness connector and   black probe to ground, Second Technician (Operator’s Station) l   Reconnect three battery ground straps (page 10-268). First    Technician (Left Side   of   Engine) l   Check    if  meter   indicates 18  to   30   volts    dc. Does   meter    indicate 18  to   30  volts   dc? o- n + 0 II \a\ /0 TO   ENGINE GROUND 6 AO Oc CONTACT B CKT    14A %=akiw+a W Low”v==‘“ PROTECTION RELAY Repair    engine electrical harness (CKT    14A) (page 10-298). \ 1 1 CKT t 1 p&’’=fEp----’<’qHi:LI CONTACT ,  TA106793 4-104