TM 5-4310-451-14
Table 4-3. Electrical Troubleshooting.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1
ENGINE WILL NOT CRANK.
NOTE
Ensure that batteries are fully charged.
Ensure that cables are in good condition and installed correctly.
Ensure that connectors are clean and secure on terminals.
Step 1
Check starter circuit fuse.
If bad, replace fuse (see paragraph 4-57).
If good, perform step 2.
NOTE
When testing for voltage, negative lead from multimeter should be ground (air compressor unit frame).
An assistant is required to push and hold engine start button and engine override button.
Step 2
Push engine start button and test for voltage at button terminals. Is voltage present?
If NO, replace engine button start (see paragraph 4-56). Start engine to verify malfunction has
been corrected.
If YES, perform step 3.
Step 3
Push engine start button and test for voltage at engine starter solenoid. Is voltage present?
If NO, replace wire from engine start button to engine starter solenoid (see paragraph 4-59).
Start engine to verify malfunction has been corrected.
If YES, replace engine starter (see paragraph 4-53). 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 4-60).
If OK, perform step 2.
Step 2
Check battery cables for proper size, freedom of corrosion, and proper installation
If NOT OK, repair or replace wiring harness (see paragraph 4-61).
If OK, perform step 3.
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