TM 9-2330-390-14&P
Table 4-2. Unit Troubleshooting (Con't).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3.
Step 4.
Step 5.
Step 6.
Step 7.
Check for continuity in each wire of intervehicular cable. There should be continuity. Check for
continuity between pins/sockets at connector plug ends. There should be no continuity.
Replace damaged intervehicular cable.
Disconnect intradolly cable from forward junction box and rear junction box (see paragraph 2-7).
Check for damage to receptacle connectors at forward junction box and rear junction box.
Replace damaged receptacle connectors (see paragraph 4-35 and 4-37).
Check for continuity in each wire of intradolly cable. There should be continuity. Check for
continuity between pins/sockets at connector plug ends. There should be no continuity.
Replace damaged intradolly cable.
Check ground wires in signal conditioning box, forward junction box, and rear junction box to
ensure that they are secure. Check for looseness and damage to terminal blocks and wires inside
boxes.
Clean and tighten ground wires and other components as required (see paragraph 4-34,
4-35, and 4-37).
Disconnect intervehicular cable from towing vehicle and signal conditioning box (see
paragraph 2-7). Check for continuity in wires between J1 receptacle connector in signal
conditioning box and J3 receptacle connector in forward Junction box. Check also for continuity
between J2 receptacle connector in signal conditioning box and J3 receptacle connector.
NOTE
Circuits containing voltage reducers will reflect high resistance in one direction.
Reversing multimeter leads will result in low resistance.
When continuity in a circuit between J1 or J2 receptacle connector and J3 receptacle
connector is not present, check for continuity across terminals of circuit breaker inside
signal conditioning box. If there is no continuity, replace circuit breaker (see
paragraph 4-34).
Step 8.
Check for continuity from circuit breaker inside signal conditioning box to TB1 terminal block
inside forward junction box. Check for continuity from TB1 terminal block to J3 receptacle
connector.
Replace damaged signal conditioning box-to-forward junction box cable assembly (see
paragraph 4-46) or repair damaged forward junction box (see paragraph 4-35).
Step 9.
If malfunction persists, perform voltage check across terminals of all circuit breakers.
If voltage is not present, replace circuit breaker (see paragraph 4-34).
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