TM 5-4310-452-14
Table 4-3. Electrical Troubleshooting Procedures.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ENGINE WILL NOT CRANK.
NOTE
• Ensure that batteries are fully charged.
• Ensure that cables are good and correctly installed.
• Ensure that connectors are clean and secure on terminals.
Step 1. Check starter circuit fuse.
If bad, replace fuse (see paragraph 4-40).
If OK, go step 2.
NOTE
• When testing for voltage, negative lead from multimeter should be to ground
(trailer frame).
• An assistant is required to push and hold the START button and SAFETY CIRCUIT
BYPASS button.
Step 2. Push START button and test for voltage at switch terminals, Is voltage present?
If NO, replace start switch (see paragraph 4-46), then start engine to verify malfunction
has been corrected.
If YES, go to step 2.
Step 3. Push START button and test for voltage at magnetic starter switch. Is voltage present?
If NO, repair or replace wire from start switch to magnetic starter switch, then start engine to
verify malfunction has been corrected.
If YES, replace magnetic starter switch (see paragraph 4-61), then start engine to verify
malfunction has been corrected.
Step 4. Push START button and test for voltage at starter solenoid. Is voltage present?
If NO, replace wire from start switch to starter solenoid, then start engine verify malfunction
has been corrected.
If YES, replace starter (see paragraph 4-39), then start engine to verify malfunction
has been corrected.
2. ENGINE CRANKS SLOWLY.
Step 1. Test voltage of batteries (see TM 9-6140-200-14).
If NOT OK, charge or replace storage batteries (see paragraph 4-57).
If OK, go to step 2.
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