TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
10. NO TRANSIT LIGHT DOES NOT OPERATE PROPERLY (MODEL A ONLY)
(continued).
KNOWN INFO
13.
TEST OPTIONS
Continuity Test.
NO TRANSIT WHEN LIT
Is there continuity
indicator bulb never
measured on the (24-
REASON FOR QUESTION
comes on.
pin) linking harness
NO TRANSIT WHEN LIT
between cab control
If the (24-pin) linking
indicator bulb OK.
box connector (P2)
harness is faulty, the
Hook arm down proximity
and main junction box
hook arm down proximity
switch OK.
connector (P4)?
switch will not function.
No hook arm down signal
at cab control box.
Cab control box power
output OK.
Cab control box ground
circuit OK.
POSSIBLE PROBLEMS
Linking wire harness
Replace (24-pin)
faulty.
linking wire harness
NO
Main junction box
harness faulty.
YES
Change 1
4-190
