TM 5-6115-593-12
TO 35C2-3-463-1
Table 4-3. Organizational Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. ENGINE FAILS TO CRANK WHEN MASTER SWITCH IS MOVED TO START.
Step 1.
Using a hydrometer, measure the specific gravity of the electrolyte in each cell (refer to paragraph 4-16)
If batteries are not charged, ensure that the battery charger is operating and allow sufficient time
to charge. If batteries fail to hold charge, refer malfunction to next higher level of maintenance.
Step 2. Check OVER CRANK indicator lamp.
If OVER CRANK indicator lamp is lit, wait until light goes out. If light fails to go out after 1 minute,
disconnect terminal 4 of the time delay relay (15, figure 4-19) from -24V DC.
If OVER CRANK indicator goes out, then TD1 may be defective and must be referred to next
higher maintenance.
If the light remains lit, timing overcrank shutdown relay K19 (part of AC-DC control relay
assembly, 18, figure 4-19) may be defective and must be referred to next higher maintenance.
Step 3.
Using a multimeter, check for 24V DC across coil of start/stop/run relay K5 (located on TB10, 92, figure 4-
20, sheet 2).
If 24V DC is absent, then test MASTER SWITCH (38, figure 4-21) and replace if defective (see
paragraph 4-40).
If 24V DC is present, proceed to next stop.
Step 4.
Using a multimeter, check for 24V DC across coil or relay K54 (part of AC-DC control relay assembly, 18,
figure 4-19).
If voltage is absent, K5 may be defective and must be referred to next high maintenance.
If 24V DC is present, check for 24V DC across contacts 1 and 2 of K54. If 24V DC is present, K54
may be defective and must be referred to next higher maintenance.
If reading is zero, proceed to next step.
4-20
