TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
4.
MAIN FRAME WORKLIGHT DOES NOT OPERATE (MODEL A ONLY) (continued).
9.
TEST OPTIONS
KNOWN INFO
Is there continuity
Worklight bulb OK.
Continuity Test.
measured between the
Spotlight OK.
REASON FOR QUESTION
main frame junction
Supply harness OK.
box connector (P6) and
Cab control box OK.
Power is transferred from
the main frame junc-
Linking harness OK.
the main junction box to
tion box terminal strip?
Main junction box OK.
the main frame junction
box via the main frame
POSSIBLE PROBLEMS
junction box harness and
Main frame junction box
connector. If there is no
harness faulty.
voltage measured at the
Worklight harness faulty.
terminal strip, either the
wire harness or its
connector is faulty.
Replace main
frame junction
NO
box harness
YES
Change 1
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