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Hughes 9300 Series Installation Guide
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 the 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. To ground the IDU in case the grounding
provided by mounting bracket is insufficient, connect a grounding wire from the chassis
grounding wing nut to the vehicle chassis.
Figure 10 – Grounding Nut
10
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