When planning the installation, be aware that the maximum current consumption is 5.5 A during PTT and up
to 33 mA (non-Ethernet) or 90 mA (Ethernet) when your radio is switched off. For power supply specification,
see Model Specifications on page 17.
For low supply voltage, consider the following factors:
● If the supply voltage measured on the power supply terminal of your radio drops below 10.8 V for more
than 500 ms, the display shows Battery Low.
● If the supply voltage measured on the power supply terminal of your radio drops below 9.7 V for more
than 500 ms, the display shows Battery Empty and turns off.
● For vehicles with heavy electrical loads such as ambulances or fire trucks, add a backup battery supply
separated from the electrical installation.
● If your radio turns off due to low supply voltage conditions, it remains in boot loader mode. When the
supply voltage rises enough, your radio consumes over 500 mA of power supply. This condition can drain
a weak or old battery that is left overnight or for a longer time in low temperatures. Recharge the battery
using an external charger. To trigger the power-up sequence, the ignition pin voltage must go below 3.1 V
and rise again above 9.7 V.
2.2
Disconnecting Your Radio Power Supply
Procedure:
1. Before uninstalling your radio, perform the following:
a. Turn off your radio.
b. Wait for a minimum of four seconds after your radio switch is released.
c. Disconnect the 13.2 V main power supply.
2. Alternatively, turn off the main power supply without turning off your radio.
2.3
Installing DC Power Cable
CAUTION: Your radio must be operated only in negative ground electrical systems. Operating your
radio on a positive ground system causes the cable fuse to short-circuit. Check the vehicle ground
polarity before you begin the installation.
Prerequisites:
Determine a routing plan, keeping in mind where to mount your radio as well as the following factors:
● Whenever possible, avoid routing the cable above the catalytic converter.
● Make sure that the power cable never rests on sharp edges.
● Use grommets whenever a cable has to pass through a hole in a metal panel.
CAUTION: Improper handling of the power cable can cause shorting to the ground. Ensure that during
radio installation the power cable fuse is removed. Ensure that your power cable is not placed in parallel
with the antenna. Interference can cause your radio to hang.
Procedure:
1. Locate an existing hole with the grommet in the vehicle fire wall, or use a 9.5 mm (3/8 in.) bit to drill an
access hole in the fire wall.
CAUTION: Be careful not to damage existing wires.
MN009998A01-AA
Chapter 2: Vehicle Preparation
33
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