TM 9-2330-390-14&P
Table 4-2. Unit Troubleshooting (Con’t).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 11.
Check for continuity in wires between J1 or J2 receptacle connector in signal conditioning box and
circuit breakers.
If there is no continuity, replace damaged J1 or J2 receptacle connector or repair damaged
wires (see paragraph 4-34).
Step 12.
If malfunction persists, perform voltage check across terminals of all circuit breakers.
If there is no voltage, replace damaged circuit breaker (see paragraph 4-34).
4.
DIM OR FLICKERING LAMPS.
NOTE
Dim or flickering lamps are most often caused by loose or corroded connections.
Check for these conditions while performing troubleshooting test and inspections.
Check that affected lamp is not loose in light socket (see paragraph 4-38, 4-39, 4-40, or 442).
Securely install lamp in light socket (see paragraph 4-38, 4-39, 4-40, or 4-42).
Perform steps 2 through 12 of Malfunction 3, One or More Lamps (But Not All) Fail to Light.
5.
ONE OR MORE LAMPS BURN OUT FREQUENTLY.
NOTE
If one or more lamps burn out frequently or immediately after replacement, a probable
cause is a failed voltage reducer inside signal conditioning box.
Step 1.
Inspect voltage reducer on affected circuit inside signal conditioning box for loose or
disconnected wires.
Connect and tighten wires.
Step 2.
With intervehicular cable connected and towing vehicle power on (see paragraph 2-11), check
voltage at output of voltage reducer on affected circuit. Voltage should be 12 v.
Replace damaged voltage reducer (see paragraph 4-34).
4-32
