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ENGINE CRANKS BUT DOES NOT START WHEN ETHER INJECTOR IS ACTUATED IN COLD WEATHER
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TM-9-2320-279-20-1 5-Ton 6x6 M39 Series Trucks (Multifuel) Manual
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ENGINE BRAKE WILL NOT OPERATE.
TM 9-2320-279-20-1
Troubleshooting Malfunctions (Cont)
2-15. TROUBLESHOOTING INSTRUCTIONS (CONT).
Table 2-9. Troubleshooting
Malfunction
Test or Inspection
Corrective Action
ELECTRICAL SYSTEM
NOTE
.
Repair of electrical harnesses is limited to splicing new wires into the harness with
crimp connectors, taping the new wire to the harness, and replacing electrical
connectors. If two or more wires in a harness are found to be defective, notify the
supervisor for repair or replacement of harness. Wires that are not in a harness can
be replaced or repaired as required.
There are many different types of electrical connectors used to attach wires or cables
l
to electrical components on the vehicle. To install wires in crimp-type connectors,
refer to FM 55-506-l.
1.
BATTERY WEAK OR FAILS TO MAINTAIN CHARGE.
Step 1.
Check that BATTERY gage reads 22 volts (min) with ENGINE switch ON.
If not, service batteries (TM 9-6140-200-14).
Step 2.
Check for loose, damaged or missing alternator belts.
Adjust loose belts (para 6-14) or replace damaged or missing belts (para 6-15).
Step 3.
Check battery cables and alternator wiring for continuity.
Repair broken wires and connectors.
Step 3.1
Check that wire No. 831 at regulator has 22 volts (min) with ENGINE switch ON.
If not, perform step 3.2.
Step 3.2
Remove circuit breaker compartment cover (para 7-43). Check circuit breaker No. 9 for
continuity (fig. 2-2).
Replace defective circuit breaker No. 9 (para 7-43).
I
Step 4.
Perform alternator test (para 7-2).
If voltage is low, adjust regulator (para 7-6), then replace regulator or alternator
(para 7-5 or 7-3) as necessary.
Change 3

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