TM 9-2320-364-20-3 2-2708 10.  OUTRIGGERS DO NOT OPERATE (CONT). 19. Repair black wire (see schematic Fig 2-58) or notify DS Maintenance.   Verify repair, go to Step 24 of this Fault. YES NO WINCH/CRANE switch in   CRANE position. Self recovery winch operates. Hose 2902 OK. Crane hoses and tubes OK. Wire 1738 OK. White wire from truck connector   MC29 to rectifier OK. Rectifier OK. White wire from rectifier to   POWER switch OK. POWER switch OK. Black wire from POWER   switch to OSS OK. OSS OK. Red wire from OSS to crane   junction box, terminal 19 OK. Outrigger/mast shutdown valve   harness connector white   wire OK. Outrigger/mast shutdown   valve harness connector   black wire OK. Outrigger/mast shutdown valve   harness connector black   wire OK. WINCH/CRANE switch OK. Wire 1731 OK. Black wire from truck connector   MC29 to system shutdown   relay faulty. System shutdown relay faulty. White wire from system   shutdown relay to crane   junction box, terminal 3   faulty. Main hydraulic pressure valve   harness connector white   wire faulty. Main hydraulic pressure valve   harness connector black   wire faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Voltage test. STE/ICE-R #89. If black wire from truck connector MC29 through crane junction box terminal 6 to system shutdown relay is loose, faulty or shorted to black wire; 22 to 28 vdc will not be input to main hydraulic pressure valve. WARNING Are 22 to 28 vdc measured at system shutdown relay black wire with engine switch ON and hydraulic selector switch in CRANE/SRW position? Read   WARNING on Page 2-2709