Specifications

TM 9-2330-384-14&P
Table 4-2. Unit Troubleshooting Procedures (Con't).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. ALL LIGHTS ON A CIRCUIT DO NOT OPERATE
WARNING
When troubleshooting an electrical malfunction, ALWAYS disconnect
intervehicular cable from semitrailer. Failure to follow this warning may
create a spark and explosion,
resulting in serious injury or death to
personnel.
NOTE
• Refer to paragraph 4-30 to determine routing of electrical wires and
location of electrical components.
• Refer to Table 4-3 to determine which lights operate off same circuit
breaker circuit.
• To ensure an accurate reading, probes of multimeter must contact bare
wire and unpainted metal surfaces.
Step 1. Troubleshoot tractor electrical system (see TM 9-2320-273-20 or TM 9-2320-
283-20).
Step 2. Check circuit across circuit breaker posts.
If there is continuity, circuit breaker is O.K. Go to step 3. If at circuit breaker #3,
#4, or #9, go to step 4.
If there is no continuity, replace circuit breaker (see paragraph 4-16). If
malfunction still exists, go to step 3. If at circuit breaker #3, #4, or #9, go to
step 4.
NOTE
Perform step 3 if at circuit breaker #1, #2, #5, #6, #7, or #8.
Step 3.
Check continuity in wire between circuit breaker post and pin at front of 12-volt
electrical connector.
If there is continuity, that wire is O.K. If at circuit breaker #1, #2, #5, or #6, go
to step 7. If at circuit breaker #7 or #8, go to step 5.
If there is no continuity, replace wire (see paragraph 4-17). While replacing
wire, visually inspect for a bent or corroded connector pin. If pin is damaged,
replace electrical connector (see paragraph 4-17). If malfunction still exists,
and if at circuit breaker #1, #2, #5, or #6, go to step 7. If at circuit breaker #7 or
#8, go to step 5.
4-17