TM    9-2350-256-20 SECTION   V:   TROUBLESHOOTING c.    ELECTRICAL    TROUBLESHOOTING Electrical    troubleshooting    in    this    chapter    includes schematic   diagrams   to   give   insight   to   the   harnesses involved. When troubleshooting any electrical system or component, exercise care to prevent electrical shock. W A R N I N G Ensure    MASTER    switch    is    OFF    between    every    step    unless    otherwise    directed    throughout troubleshooting    of    the    electrical    stem    or    electrical    components. Remove  all  jewelry  and  metal objects when working on electrical systems to prevent injury due to electrical shock. The  multimeter  is  used  throughout  electrical  troubleshooting. STE/ICE-R can also perform as a multimeter and instruction on its use is in TM 9-4910-571-12&P. 2 - 1 6   Q U I C K   G U I D E   T O   T R O U B L E S H O O T I N G a.   MECHANICAL Item Engine Fuel,   Air Intake,   and Exhaust Systems Oil   Cooling System Ventilation Blower Assembly Problem 1 2 3 4 1 2 3 4 5 6 1 2 3 4 1 2 3 Engine  fails  to  crank  when  start  switch  is  pressed. Engine cranks at normal speed but will not start after two attempts   to   start. Engine cranks at normal speed but will not start during extreme cold   weather. Engine  cranks  slowly  and  will  not  start. Engine start running but fails to stay running. Engine  fails  to  shut  off  when  the  engine  fuel  shutoff  switch  is activated. Engine  fails  to  stop  when  fuel  shutoff  handle  is  pulled. Engine stalls at low rpm, does not develop full power, and has excessive  smoke  from  one  or  both  banks  of  cylinders. Engine stalls at low rpm and does not develop full power, but exhaust smoke is normal. Engine runs rough or misfires, knocks, and/or fuel consumption is excessive. Low engine oil pressure, engine oil temperature normal. High  engine  oil  pressure,  engine  oil  temperature  normal. Engine oil consumption excessive. High   engine   oil   temperature. Blower motor does not run Blower  rum  but  does  not  come  up  to  speed. Blower   unusually   noisy. Solution or Reference See page 2-30 See page 2-30 See  page  2-40 See  page  2-40 See  page  2-40.4 See  page  2-40.4 See  page  2-40.4 See  page  2-40.3 See  page  2-40.4 See  page  2-40.4 See  page  2-40.7 See  page  2-40.7 See  page  2-40.7 See  page  2-40.7 See  page  2-40.9 See  page  2-40.9 See  page  2-40.9 Change  1  2-35