TM 5-4310-452-14
Table 4-3. Electrical Troubleshooting Procedures (Con't).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 2. Check battery cables for proper size, freedom of corrosion, and proper installation.
If NOT OK, repair or replace wiring harness (see paragraph 4-63).
If OK, go to step 3.
NOTE
If ambient temperature is below 32o F (0°C) check that engine oil and diesel fuel ratings are
correct.
Step 3. Test current draw of starter motor,
If NOT OK, replace starter (see paragraph 4-39).
If OK, start engine to verify malfunction has been corrected.
3. ENGINE CRANKS, BUT WILL NOT START.
NOTE
• The engine must crank fast enough to obtain heat of combustion for ignition. If
engine cranking speed is too slow, see Malfunction 2, ENGINE CRANKS SLOWLY.
• When testing for voltage, negative lead from multimeter should be to ground
(trailer frame).
• Always replace wire with the same size (gage).
• An assistant is required to push and hold the START button and SAFETY CIRCUIT
BYPASS button when testing voltage.
Step 1. Push START button and test for voltage at shutdown relay. Is voltage present?
If NO, test and replace wiring to shutdown relay. Start engine to verify malfunction has
been corrected.
If YES, replace shutdown relay (see paragraph 4-62), Start engine to verify malfunction
has been corrected.
Step 2. Push START button and test for voltage at fuel solenoid valve. Is voltage present?
If NO, test and replace wiring to fuel solenoid valve. Start engine to verify malfunction
has been corrected.
If YES, replace fuel solenoid valve (see paragraph 4-59), Start engine to verify
malfunction has been corrected.
4. AMMETER INDICATES NO/LOW "CHARGE" CONDITION WITH ENGINE IDLING.
Step 1. Check for loose, broken or slipping alternator belt.
If OK, go to step 2.
If NOT OK, adjust or replace alternator belt (see paragraph 4-37). Start engine to verify
malfunction has been corrected.
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