TM 10-3930-671-24 b) Voltage  above  9.6  volts.    If  the  voltage  stays above 9.6 volts: (1) Be  sure  all  battery  connections  are  clean and tight. (2) Test    the    current    draw    of    the    starter. Connect    an    ammeter    and    carbon    pile battery    load    tester    in    parallel    with    the battery terminal of the starter solenoid and ground (frame or battery negative terminal).      Be   sure   that   the   tester,   is turned OFF. Clip-on inductance tester may be used. (3) Increase  the  load  (current)  until  the  same voltage   is   reached   as   measured   when cranking  the  engine.    Note  the  ammeter reading.        Turn    OFF    the    load.        The ammeter   reading   indicates   the   cranking system current draw. (4) Compare the measured system draw with the   typical   current   requirements   of   the diesel engine lift truck system. Typical starter current draw: 180-220 amps. c) Low  current  means  high  circuit  resistance. Clean connections or replace wiring. (1) If   the   current   draw   is   low,   measure   the voltage  drops  in  the  starter  motor  circuit (see   Starting   System   Electrical   Checks) while cranking the engine.  Large drops of over  0.4-1  volt  indicate  the  need  to  clean and  tighten  connections  or  replace  wiring in that portion of the circuit. (2) Use  volt-drop  test  to  find  source  of  high resistance. d) High current means high drag resistance. (1) If    excessive    current    is    observed,    then either a poor engine condition exists, such as   tight   rings,   tight   bearings,   or   lack   of lubrication,  or  the  starter  motor  needs  to be   removed   and   repaired.      The   starter motor should be checked for tight bearings,  pole  shoe  rubbing,  and  shorted or grounded armature or field coils. (2) Use    torque    wrench    to    measure    force required to turn engine over. Nothing Happens When Start Attempt Made 1. If the starter motor won’t crank the engine, it may be  simply  a  poor  electrical  contact  that  is  the problem.  Loose or corroded battery connections can slow down or stop a starter motor.  A loose connection may allow enough current to pass to operate  some  electrical  accessories  but  not  the starter motor. 2. The    problem    may    be    either    a    defective    or discharged battery. 3. The   problem   may   be   an   open   circuit,   loose connection,  or  other  defect  in  the  starter  motor, solenoid     switch,     starter     relay,     neutral     start switch, ignition switch, or the wiring. 4. The  best  procedure  in  diagnosing  this  type  of starting  problem  is  to  systematically  check  the possible trouble points, starting with the easiest. See following procedures. F-300