TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
6.
INDICATOR/PANEL LIGHTS DO NOT OPERATE (MODEL A ONLY) (continued).
ACCESS
PANEL
VOLTAGE TEST
(1) Remove four screws and
lockwashers and access panel
from heater compartment.
(2) Remove supply harness connector
(P1) from supply harness
connector (J1).
(3) Turn engine start switch to ON
position.
CAB
(4) Turn light control switch to STOP
CONTROL
LIGHT position.
BOX
(5) Set multimeter to voltage position.
(6) Place positive (+) probe of
multimeter on supply harness
connector (P1), position B.
SUPPLY HARNESS
(7) Place negative (-) probe of
CONNECTOR (P1)
multimeter on known good ground,
and check multimeter for voltage
reading.
(8) Turn engine start switch and light
control switch to OFF position.
Change 1
4-117
