TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
9.
LHS ENGAGED INDICATOR LIGHT DOES NOT OPERATE (MODEL A ONLY)
(continued).
4.
KNOWN INFO
TEST OPTIONS
CB 15 OK.
Continuity Test.
Is there continuity
L.H.S. ENGAGED
between the LHS
REASON FOR QUESTION
indicator bulb OK.
indicator light socket
Voltage to L.H.S. indicator
and relay K4, position
The ground for the LHS
bulb.
30?
indicator bulb is provided
through relay K4. If there
POSSIBLE PROBLEMS
is continuity measured in
Cab control box faulty.
this test, the ground
circuit to relay K4 is OK.
Repair cab control
NO
box (para 4-71).
Fault not corrected.
YES
Notify supervisor.
4-158
Change 1
