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
12.
TEST OPTIONS
NO TRANSIT WHEN LIT
Is there continuity
Continuity Test.
indicator bulb never
measured at the cab
comes on.
control box connector
REASON FOR QUESTION
NO TRANSIT WHEN LIT
(J2), position Q, and a
The hook arm down
indicator bulb OK.
known good ground?
proximity switch is
Hook arm down proximity
grounded through the cab
switch OK.
control box. If there is an
No hook arm down signal
open circuit inside the
at cab control box.
box, the switch will not
Cab control box power
function.
output OK.
POSSIBLE PROBLEMS
Cab control box faulty.
Linking wire harness
faulty.
Main junction box
Repair cab control
NO
harness faulty.
box (para 4-71).
YES
4-188
Change 1
