TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
7.
HOURMETER DOES NOT OPERATE (MODEL A ONLY).
INITIAL SETUP
Tools and Special Tools
Equipment Condition
Multimeter (ANURM105C)
Engine turned off (TM 9-2320-279-10)
Tool Kit, General Mechanic's: Automotive
Parking brake applied (TM 9-2320-279-10)
(SC 5180-90-N26)
Wheels chocked (TM 9-2320-279-10)
START
TEST OPTIONS
1.
KNOWN INFO
Voltage Test.
None.
Are 2228 volts
measured at main
REASON FOR QUESTION
junction box terminal
POSSIBLE PROBLEMS
strip, position 25?
To isolate the location in
Hourmeter faulty.
the circuit where fault
Hourmeter wire harness
exists. If there is power
faulty.
at the terminal strip, that
Cab control box faulty.
part of the circuit up to
Linking harness faulty.
the terminal strip is OK.
Junction box harness
It is likely that the
faulty.
hourmeter is defective.
LHS MODE SELECT
switch faulty.
Go to Step 3.
NO
YES
Change 1
