TM 5-5420-234-14&P
4-12. UNIT TROUBLESHOOTING (continued).
4.
MAIN FRAME WORKLIGHT DOES NOT OPERATE (MODEL A ONLY) (continued).
CONTINUITY TEST
(1) Remove eight screws and side panel
from heater compartment.
(2) Remove four screws and lockwashers
and access panel from heater
compartment.
CAUTION
Electrical power must be shut off
from circuit before continuity can
be checked. Failure to comply
with this caution may result in
damage to test equipment or elec-
ACCESS
trical system.
COVER
(3) Disconnect supply harness
connector from cab control box.
(4) Set multimeter to ohms position.
NOTE
A reading of infinity indicates an
open circuit.
(5) Connect multimeter leads to each
end of wire, and check multimeter for
continuity. Check between cab
worklight switch (terminal with two
wires) and the supply harness
SUPPLY HARNESS
connector, position H.
CONNECTOR (P1)
NOTE
Any reading besides infinity indi-
cates a grounded wire.
(6) Remove multimeter lead from one
end of wire and connect to chassis
ground.
Change 1
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