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5.3 ELECTRICAL POWER CONNECTIONS
5.3.1 Overview
The LectroCount
3
is designed to run only
when the ignition switch is in the “on” or
“accessory” position. This prevents the
LectroCount
3
from being damaged by
the voltage spikes or electrical noise
that occur when the starter is engaged,
or from draining the truck battery power
when the truck isn’t running.
Voltage from the battery is switched by
a relay that is controlled by the truck’s
accessory circuit. It is vital that the
battery and accessory cables be
properly connected and fused, and that
the SCM is properly grounded.
5.3.2 Run Battery Cable
(Part Number 81232)
The battery cable is supplied with
heavy-duty ring terminals that must be
installed directly to the battery posts.
Make sure that the truck’s electrical
system has been properly checked.
Clean the battery terminals for a
good electrical connection.
q Remove the ATO 7.5 amp fuse from
the battery cable’s black splash-
proof fuse holder so that the wire is
not live while the cable is routed and
terminated.
q Attach the black cable to the
negative (-) terminal of the battery.
q Connect the orange cable terminal
to the positive (+) terminal of the
battery.
q On truck systems with several
batteries connected in parallel, the
last battery in the system usually has
the least number of connections and
will be the best location to attach the
battery cable.
q Route the cable to the supervisory
control module in the truck cab.
q Seal any holes that you may have
made in the cab wall.
(continued next page)
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