TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
10. NO TRANSIT LIGHT DOES NOT OPERATE PROPERLY (MODEL A ONLY
continued).
14.
KNOWN INFO
TEST OPTIONS
Continuity Test.
Is there continuity
NO TRANSIT WHEN LIT
between the main
indicator bulb never
REASON FOR QUESTION
junction box connector
comes on.
If there is an open circuit
(J4) and the junction
NO TRANSIT WHEN LIT
between the main
box terminal strip?
indicator bulb OK.
junction box connector
Hook arm down proximity
and the junction box
switch OK.
terminal strip, no power
No hook arm down signal
will reach the proximity
at cab control box.
switch.
Cab control box power
output OK.
Cab control box ground
circuit OK.
Linking wire harness OK.
POSSIBLE PROBLEMS
Replace main
junction box
Main junction box
NO
harness (para 4-84).
harness faulty.
Fault not corrected.
YES
Notify supervisor.
4-192
Change 1
