TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
5.
HAND-HELD SPOTLIGHT DOES NOT OPERATE (MODEL B ONLY) (continued).
NOTE
The digital controller and the cab control box are not repairable,
therefore, it is necessary to test the digital controller and cab
interface wiring harnesses, switches, solenoids, and other com-
ponents to identify possible faults other than the digital controller
and the digital cab controller.
10.
TEST OPTIONS
KNOWN INFO
Error Codes, EC11
Voltage Test.
Are 2228 volts mea-
Spotlight bulb OK.
sured at cab interface
REASON FOR QUESTION
Worklight switch OK.
wiring harness connec-
Wire no. 40 OK.
tor (J2), position # 2
The hand-held spotlight
and position # 6?
receives its power source
POSSIBLE PROBLEMS
from the cab interface
wiring harness. The
Cab interface wiring
hand-held spotlight will
harness faulty.
not operate if there is no
Digital controller wiring
voltage supply at
harness faulty.
positions # 2 and # 6.
Digital control box faulty.
Repair or replace
cab interface
NO
wiring harness
YES
4-114.2
4- 2
Change 1
