TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
4.
MAIN FRAME WORKLIGHT DOES NOT OPERATE (MODEL A ONLY) (continued).
5.
KNOWN INFO
TEST OPTIONS
Spotlight OK.
Worklight bulb OK.
measured between the
REASON FOR QUESTION
worklight switch (terminal
POSSIBLE PROBLEMS
with two wires) and the
Power is transferred from
supply harness connector
Supply harness faulty.
the worklight switch to
(P1), position H?
Cab control box faulty.
the cab control box via
Linking harness faulty.
the supply harness.
Main junction box faulty.
Main frame junction box
harness faulty.
Worklight harness faulty.
Replace supply harness
NO
YES
4-84
Change 1