TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
4.
MAIN FRAME WORKLIGHT DOES NOT OPERATE (MODEL A ONLY) (continued).
TEST OPTIONS
8.
KNOWN INFO
Is there continuity in
Continuity Test.
Worklight bulb OK.
the main junction
Spotlight OK.
REASON FOR QUESTION
box, between (9-pin)
Supply harness OK.
linking harness con-
Cab control box OK.
The worklight power
nector (J3), position
Linking harness OK.
source is transferred from
G, and main frame
the (9-pin) linking har-
POSSIBLE PROBLEMS
junction box harness
ness to the main frame
connector (J6), posi-
Main junction box faulty.
junction box harness via
tion H?
Main frame junction box
the main junction box. If
harness faulty.
there is an open circuit
Worklight harness faulty.
within the junction box,
the worklight will not
operate.
Repair main
NO
junction box
YES
Change 1
4-90
