TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
4.
MAIN FRAME WORKLIGHT DOES NOT OPERATE (continued).
3.
TEST OPTIONS
KNOWN INFO
Error Codes, EC11 and
Worklight Switch Test.
Is there continuity
EC12
between the two
REASON FOR QUESTION
Worklight bulb OK.
terminals on the
Both worklight and
worklight switch?
Worklight will not
spotlight are inoperative.
operate if cab switch is
defective.
POSSIBLE PROBLEMS
Worklight switch faulty.
Wire no. 40 faulty.
Replace worklight
NO
switch (TM 9-
2320-279-20).
YES
4-80
Change 1
