Dc Power Cable And Main Fuse Holder Installation - Harris M7300 Installation And Product Safety Manual

radio. The white wire of the radio's DC Power Cable is connected to a fused switched power source,
typically identified as vehicle "Accessory" power. This source must switch on (up to positive (+)
battery voltage potential) when the vehicle's ignition switch/key turns on, and it must switch off (to
near zero volts) when the ignition switch/key turns off. The required fuse rating is 3 amperes. When
using this configuration, the on/off/volume control must be left in the on position for automatic
power-up/down to function properly.
In a front-mount M7300 radio installation, to fuse the white wire of the radio's DC
Power Cable, a waterproof (HFB type) fuse holder and a 3-amp AGC fuse are included
with the cable.

Radio turns on and off with a manual switch — This configuration is used when, for example, the
radio must remain on even when the ignition key must be removed from the vehicle and a separate
on/off switch is acceptable. The white wire of the radio's DC Power Cable is connected to one side of
a manually-controlled switch, and the other side of this switch is connected to unswitched and fused
vehicle power. The required fuse rating is 3 amperes. When using this configuration, the
on/off/volume control must be left in the on position for automatic power-up/down to function
properly.

Radio turns on with its on/off/volume control ("hot wired") — This configuration allows radio
on/off power control only via its on/off/volume control. It may be desired if, for example, the radio
must remain on even when the ignition key must be removed from the vehicle and a separate on/off
switch is not desired and/or not acceptable. The white wire of the radio's DC Power Cable must be
connected to unswitched and fused vehicle power. The required fuse rating is 3 amperes.
In all of the above cases, the radio's main DC power input (red wire) must be connected through an in-
line fuse to unswitched vehicle DC power. The red wire must be connected to raw battery power (positive
battery terminal) via the supplied fuse.
Any DC input power provided to the radio shall be no higher or lower than
13.6 volts DC 10%. The DC input power should be free and clear of any AC noise or
DC spikes above 18 volts. If the vehicle cannot meet these requirements, then DC
conditioning will be required before any DC is connected to the radio. This includes
conditioning for both the radio's main DC power input lead and for its switched ignition
sense power input. DC conditioning can be accomplished by a noise filter or DC
CAUTION
isolation equipment such as Harris part number FL-018314-001 or FL-018314-002, or
similar units equal specifications. Fusing must be placed in-line before any noise filter.
Contact TAC for additional information.
7.2.2

DC Power Cable and Main Fuse Holder Installation

The radio's DC Power Cable has a 3-pin connector, a 20-foot red wire (for the main power connection), a
20-foot white wire (for the switched power source connection), and a 4-foot black wire (for the ground
connection). It is supplied with waterproof fuse holders, two AGC-type fuses, and non-insulated ring
terminals. The following installation procedures are recommended:
7.2.2.1 Black Wire Connection (Ground Wire)
1. Connect the radio's DC Power Cable to the radio by mating its 3-pin connector to the radio's 3-pin
power cable connector as follows: Visually align the key and firmly push and turn the outer locking
ring clockwise until it stops. A click will be sensed to confirm proper mating.
MM-014763-001, Rev. E
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