TM  10-3930-638-24&P 2-21.   STARTING   SYSTEM   TROUBLESHOOTING   (cont) MALFUNCTION TEST OR INSPECTION CORRECTIVE  ACTION 2. STARTER FAILS TO CRANK (cont) Step 2. Connect voltmeter leads to center terminal of starter relay and ground. Note  voltmeter  indication  while  an  assistant depresses START switch. a. b . If  voltmeter  indicates  24  Vdc, replace starter relay (para 2-27b). If  voltmeter  indicates  zero volts, proceed to step 3. Step 3. Connect voltmeter leads to terminals of neutral start switch. Note  voltmeter  indication  while  an  assistant depresses START switch. a. If voltmeter indication is a constant 24 Vdc, replace neutral start switch (para  2-31b). b. If voltmeter indication is a constant zero volts, proceed to step 4. Step 4. Tag and disconnect wires from lockout relay located at bottom center of instrument panel. Connect ohmmeter leads to B and H terminals of lockout relay. a. b. If ohmmeter indicates more than 0.1 ohm, replace  lockout  relay  (para  2-28d). If  ohmmeter  indicates  less  than  0.1  ohm, reconnect wires to lockout relay and proceed to step 5. Step  5.  Connect  voltmeter  leads  to  IGN  and  GRD  terminals  of  IGNITION  switch. With IGNITION switch set at ON, voltmeter should indicate 24 Vdc. a. If voltmeter does not indicate 24 Vdc, proceed to step 6. b. If voltmeter indicates 24 Vdc, proceed to step 7. 2-102