TM    5-5420-226-20-1 Symptom-9 DETAILED TROUBLESHOOTING PROCEDURE VEHICLE OPERATION -  POWERPLANT, STARTING (Continued) Check   engine   electrical    harness   connector    (CKT 486)  at  manifold   heater   fuel  supply   solenoid   for electrical   power. Second Technician (Rear of   Crew Compartment) l   Disconnect engine electrical harness connector from manifold heater fuel   supply solenoid connector. l   Connect red    probe of   meter to   contact A   (CKT 486) of   engine electrical harness connector and    black probe to   ground. l   Observe meter for   voltage indication when first technician operates switches. First Technician (Operator’s Station) l   Place   manual fuel    shutoff in   the    OFF (out) position. l   Set    MASTER BATTERY switch ON. l   At    the    same   time,   press   STARTER button and manifold preheat switch for   about 10  seconds, then release. l   Place   manual fuel    shutoff switch in   the    ON (in) position. Does   meter   indicate    18  to  30  volts   dc? I ~ Qg$ijJy: al ‘% .- -’ .,,1,,, --- CKT 3 -n + o II II TO   VEHICLE II c MANIFOLD HEATER ‘ FUEL   SUPPLY SOLENOID ~ ‘epai, harness   (CKT  486)   (page   10-298). -~ CKT ENGINE FUEL    SUPPLY COiTACT TA106923 4-234