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ARMY TM 9-2815-255-24 AIR FORCE TO 38G1-95-2 MARINE CORPS TM 2815-24/4 f. Check field windings of yoke for wear or damage.  Check all connections for clean and tight solder joints. g. Measure brush length.  If less than 0.51 inch (13 mm), replace brush holder and/or yoke assembly. h. Check brush springs for damage or corrosion.  If damaged or corroded, replace brush holder. i. Check that overrunning clutch rotates freely in direction of starter rotation and that it will be locked when trying to rotate in opposite direction. 3-12.5.  Test. 3-12.5.1  Testing Starter Motor (Installed). a. Make  sure   batteries  are  fully  charged  and  that  all  battery  and  starter  cables  are  serviceable  and  properly installed. b. Set multimeter for DC volts, and connect as shown in FIGURE 3-18, Test A.  If voltage is indicated solenoid is defective. FIGURE 3-18.  Starter Solenoid Test Circuit c. Momentarily connect a jumper as shown in FIGURE 3-18, Test B.  Multimeter should indicate battery voltage and starter  should  crank  the  engine.    If  multimeter  does  not  read  battery  voltage,  the  solenoid  is  defective.    If multimeter indicates battery voltage, but starter does not operate, starter is defective. 3-12.5.2  Testing Starter Components (Removed). a. Using  a  growler  tester,  place  armature  on  it  and  hold  a  hack  saw  blade  against  armature  core  while  slowly rotating  armature.    A  short  circuited  armature  causes  blade  to  vibrate  and  be  attracted  to  core.    An  armature which is short circuited must be replaced. b. Set multimeter for ohms and touch one probe to a commutator segment and other one to armature core, refer to FIGURE 3-19.  There should be no continuity.  If there is continuity, armature is grounded.  Replace armature if grounded. 3-39


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