TM 9-2330-384-14&P
Table 4-2. Unit Troubleshooting Procedures (Con't).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
Perform step 8 if affected light operates on circuit breaker #3, #4, or #9.
Check for continuity in wire between circuit breaker post and pin at front of 24-volt
Step 8.
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 (see paragraph 4-17).
NOTE
Perform step 9 if affected light operates on circuit breaker #7 or #8 and
malfunction occurred when semitrailer was connected to 24-volt
intervehicular cable.
Step 9.
Check for continuity in wire between pin #3 or #5 of 12-volt electrical connector and
resistor. Check for continuity in wire between resistor and pin B or J at front of 24-volt
electrical connector.
If there is continuity, that wire is O.K. Go to step 10.
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,
go to step 10.
NOTE
Testing of each resistor, located on cover of voltage control unit, is the
same.
Step 10. Check resistor. Reading should be within range of 6-8 ohms.
If reading is within range of 6-8 ohms, resistor is O.K.
if reading is not within range of 6-8 ohms, replace resistor (see
Step 11. Troubleshoot tractor electrical system (see TM 9-2320-273-20 or TM 9-2320-
283-20).
If malfunction still exists, replace voltage control unit (see paragraph 4-14).
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