ARMY TM 9-6115-641-24
AIR FORCE TO 35C2-3-456-12
Table 2-6. UNIT TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ENGINE FAILS TO CRANK.
Step 1. Test for defective DEAD CRANK switch, paragraph 2-96-3.
a. If DEAD CRANK switch is not defective, do Step 2.
b. If defective, replace DEAD CRANK switch, paragraph 2-96.
Step 2. Check for loose or corroded battery cable terminals or battery posts.
a. If terminals are tight and posts are clean, do Step 3.
b. If not clean and tight, clean and tighten battery cable terminals and posts, paragraph 2-12-4.
Step 3. Check that batteries are installed correctly, paragraph 2-12-5.
a. If batteries are installed correctly, do Step 4.
b. If not properly installed, install batteries correctly, paragraph 2-12-5.
Step 4. Test for low or no battery charge, paragraph 2-12-1.
a. If fully charged, do Step 5.
b. If not fully charged, replace batteries. paragraph 2-12.
Step 5. Test for defective DC CONTROL POWER circuit breaker, paragraph 2-26-2.
a. If DC CONTROL POWER circuit breaker is not defective, do Step 6.
b. If defective, replace DC CONTROL POWER circuit breaker, paragraph 2-26.
Step 6. Test for battery voltage at terminal 1 of starter solenoid, Refer to Electrical Schematic FO-1.
a. If battery voltage is present, do Step 7.
b. If battery voltage is not present, check for loose connections from solenoid to batteries.
Step 7. Test for battery voltage at + terminal of starter solenoid with MASTER SWITCH in START position. Refer to
Electrical Schematic FO–1.
a. If battery voltage is present, replace starter solenoid. Refer to TM 9-2815–252-24.
b. If battery voltage is not present, do Step 8.
Step 8. Test for battery voltage at input of MASTER SWITCH, refer to Electrical Schematic FO-1.
a. If battery voltage is present at input terminal (6) and Grid, do Step 9.
b. If battery voltage is not present, do Step 10.
Step 9. Test MASTER SWITCH for output voltage in START position, refer to Electrical Schematic FO-1.
a. If battery voltage is present at MASTER SWITCH output terminal, do Step 13.
b. If battery voltage is not present at output terminal (7) and Grid, test MASTER SWITCH, paragraph
2-47-2.
2-12
