TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
4.
MAIN FRAME WORKLIGHT DOES NOT OPERATE (MODEL A ONLY) (continued).
7.
TEST OPTIONS
KNOWN INFO
Continuity Test.
Worklight bulb OK.
Is there continuity
Spotlight OK.
measured on the (9-
REASON FOR QUESTION
Supply harness OK.
pin) main linking
Cab control box OK.
harness between (9-
The worklight power
pin) linking harness
source is transferred
POSSIBLE PROBLEMS
connector (P5) and (9-
from the cab control box
pin) linking harness
Linking harness faulty.
to the main junction box
connector (P3)?
Main junction box faulty.
via the (9-pin) linking
Main frame junction box
harness. Faults in this
harness faulty.
harness will prevent
Worklight harness faulty.
worklight operation.
Replace (9-pin)
linking harness
NO
YES
4-88
Change 1
