TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
4.
MAIN FRAME WORKLIGHT DOES NOT OPERATE (MODEL A ONLY) (continued).
KNOWN INFO
6.
TEST OPTIONS
Worklight bulb OK.
Spotlight OK.
between the cab control
REASON FOR QUESTION
Supply harness OK.
box (9-pin) linking
harness connector (J5),
Power is transferred from
POSSIBLE PROBLEMS
position G, and the
the supply harness to
supply harness connec-
the (9-pin) linking
Cab control box faulty.
tor (J1), position H?
harness through the cab
Linking harness faulty.
control box. An open
Main junction box faulty.
circuit in the control box
Main frame junction box
will prevent worklight
harness faulty.
operation.
Worklight harness faulty.
Repair cab control
NO
YES
Change 1
4-86