TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
4.
MAIN FRAME WORKLIGHT DOES NOT OPERATE (continued).
4.
KNOWN INFO
TEST OPTIONS
Error Codes, EC11 and
Voltage Test.
Are there 22-28 volts
EC12
measured on wire no.
REASON FOR QUESTION
Worklight bulb OK.
40 at worklight switch?
Both worklight and
The voltage source for
spotlight are inoperative.
the CBT worklight
Worklight switch OK.
switch is wire no. 40 in
the HEMTT cab wire
POSSIBLE PROBLEMS
harness. Worklight will
Wire no. 40 faulty.
not operate if this wire
is defective.
Repair wire (see
schematic,
NO
YES
MODEL A, Fault not
corrected. Notify
supervisor.
MODEL B, Go to
Step 11.
4-82
Change 1
