Hughes 9450 Series, Installation Manual, Page: 19 / 31

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Standard cable connections
3004129 Revision A
9
Chapter 3 Standard cable connections
In addition to the DC power connection, an ignition sense
connection must be made. This is done using the three-wire power
cable. In the case of a vehicle installation, the power source is
typically the vehicle battery. Cables should be routed
appropriately. and cable ties and clamps should be used as required
to ensure that vibration and/or rubbing of the cables does not
occur.
Ignition sense (white
wire)
Route and connect the white wire (ignition sense) to a switched
12 or 24 Vdc source, such as accessory line or fuse block.
Extended use of ignition sense in the accessory position (ACC)
by the end user may lead to a discharged car battery.
Note: Ensure that the connection is a switched source: OFF
when ignition is off or in start and ON only when ignition switch is
in the ACCESSORIES or RUN position.
If using the car adapter plug, the ignition sense wire is already
connected to the positive power wire in the plug.
Chassis grounding
The unit includes an isolating power supply. The IDU must be
grounded by connecting a grounding wire from the chassis ground
point to the vehicle chassis. See Figure 4. The ground wire should
be clamped between the two nuts ensuring both are securely
tightened.