TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
7.
HOURMETER DOES NOT OPERATE (MODEL A ONLY) (continued).
NOTE
The hourmeter operates only when the engine start switch is in the ON position and the cab control
selector valve is in the AUTO or MANUAL position.
VOLTAGE TEST
(1) Open hydraulic cabinet cover.
(2) Loosen four screws on main
junction box cover and open
cover.
(3) Turn engine start switch to ON
position.
(4) Turn LHS MODE SELECT
switch to the AUTO or
MANUAL positions.
(5) Set multimeter to voltage
position.
(6) Place positive (+) probe of
multimeter on terminal strip
position 25.
(7) Place negative (-) probe of
multimeter on known good
ground and check multimeter
for voltage reading.
(8) Turn engine start switch to
OFF position.
WIRING REMOVED FOR CLARITY
4-121
Change 1
4
