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TM 9-2320-360-20-1
WARNING
Jewelry can catch on equipment and
cause injury or short across electrical
circuit and cause severe burns or
electrical shock. Remove rings,
bracelets, watches, necklaces, and any
other jewelry before working around
HET Tractor.
WIRE NO. 1680C VOLTAGE TEST
(1)
Turn ENGINE switch to ON position.
(2)
Place BLACK OUT LIGHTS switch in the
on position.
(3)
Place BLACK OUT MARKER switch in
the on position.
(4)
Place positive (+) probe of multimeter on
wire no. 1680C at 12-pin trailer electrical
connector.
(5)
Place negative (-) probe of multimeter on
ground and look for 10-14 volts on
multimeter.
(6)
Place BLACK OUT LIGHTS switch in the
off position.
(7)
Place BLACK OUT MARKER switch in
the off position.
(8)
Turn ENGINE switch to OFF position.
Check intervehicular cable for
continuity.
CONTINUITY TEST
CAUTION
Electrical power must be disconnected
from circuit before continuity can be
checked. Failure to comply may result in
damage to test equipment or electrical
system
(1)
Unplug trailer cable from HET Tractor and trailer.
(2)
Set multimeter to ohms position.
NOTE
A reading of infinity indicates an open
circuit.
(3)
Connect multimeter leads to each end of wires and check
multimeter for continuity.
NOTE
Any reading besides infinity indicates a
grounded wire.
(4)
Remove multimeter lead from one end of wire and connect
to chassis ground.
Change 2 2-569
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