Specifications
TM 9-2330-384-14&P
Table 4-2. Unit Troubleshooting Procedures (Con't).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3.
Visually check button contacts inside light socket for looseness, corrosion, or other
damage.
If button contacts are loose, corroded, or otherwise damaged, replace (see
paragraphs 4-20, 4-21, 4-24 through 4-26, or 4-28).
NOTE
• Use an extension wire, as required, long enough to reach between
connectors.
• Location of connectors will vary with light being checked. If connector is
inside light box at rear of semitrailer, stop/taillight must be removed (see
paragraph 4-20). If connector is at side clearance and marker light, cover
of condulet must be removed (see paragraph 4-25).
Step 4.
Trace circuit between button contact at light socket and first connector. Check
continuity in wire between button contact and first connector. Check for a short in
same length of wire. Check for loose, disconnected, or damaged connectors and
wires.
If there is continuity, that length of wire is O.K.
If there is no continuity or wire is shorted, replace wire (see paragraphs 4-20,
4-21, 4-24 through 4-26, or 4-28).
Step 5. Check for continuity and a short in wire between first connector and next connector.
Repeat wire checks until circuit breaker in voltage control unit at front of semitrailer is
reached. Check for loose, disconnected, or damaged connectors and wires.
If there is no continuity, or if wire is shorted, replace wire (see
paragraph 4-29).
Step 6. Check circuit across circuit breaker posts.
If there is continuity, circuit breaker is O.K.
If there is no continuity, replace circuit breaker (see paragraph 4-16).
NOTE
Perform step 7 if affected light operates on circuit breaker #1, #2, #5, #6,
#7, or #8.
Step 7. 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 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 as well (see paragraph 4-17).
4-15