Harris M7300 Installation And Product Safety Manual page 54

MM-014763-001, Rev. E
10. Connect the ring terminal directly to the battery's positive post (or if present, to a stud on the battery's
main/non-switched power distribution terminal block).
Most M7300 radio installations have one or more control heads connected to the radio. In
an installation of this type, the white wire of the radio's DC Power Cable requires no
electrical connection. Rather than be cut from the cable, it is recommended that it be
routed up to the vehicle's fuse box, coiled, labeled, and stowed for possible future use.
The white wire of the control head's DC Power Cable is the radio installation's ignition
sense input for on/off power control of both the control head and radio. Radio on/off
power control is accomplished by the control head. The control head "wakes-up" the radio
via data activity on the CAN link.
8.2.2.3 White Wire Connection (for Data-Only Radio Installations)
In the case of a data-only radio installation (i.e., no control head connected to the radio), the white wire of
the radio's DC Power Cable is used as the radio installation's ignition sense input. Therefore, it requires
electrical connection to a fused switched power source. The following procedure is recommended:
1. Route the 20-foot white wire of the radio's DC Power Cable to the location of the vehicle's switched
power source connection point, typically identified as "Accessory" power. Remove interior panels,
door kick panels, etc., and route the wire through existing channels in the vehicle body as necessary.
Protect the wire from possible chafing where necessary. Tie and stow the wire as necessary.
2. Connect this white wire through a fuse to the switched power source in accordance with the
instructions presented within the respective subsection of Section 8.3.4.2 (page 61) for the control
head's white wire. Follow the procedure in Section 8.3.4.2.1 (page 61) if the vehicle's ignition
switch/key must control the data-only radio's on/off power. Follow the procedure in Section 8.3.4.2.2
(page 62) if a manually-controlled switch must control the data-only radio's on/off power.
The "hot wired" wiring configuration (as depicted in Section 8.3.4.2.3) cannot be utilized
for the data-only radio, since this configuration does not employ the DC Power Cable's
white wire.
8.2.3 Additional Hook-Up Required for a Data-Only Radio Installation
The CTLON (control power on) logic input of a data-only radio must be grounded per this procedure:
1. Obtain M5300/M7300 Option Cable CA-012349-001.
2. Connect this cable's male DB-44 connector to the female DB-44 connector on the rear of the radio.
Tighten the connector's two (2) jackscrews firmly.
3. Using an appropriate DB-25 connector, hook-up wire, ring terminal and hardware (not supplied),
connect pin 14 of this cable's DB-25 connector (P4 pin 14) to vehicle ground. This grounds the
radio's CTLON input at pin 15 of the DB-44 connector. See Section 11.1 for additional information
on the Option Cable. Keep the length of the ground wire as short as reasonably possible.
4. Tie and stow the cable and wire as necessary to protect them from possible cable chafing.
When servicing the radio and/or control head, always manually power-down the radio
equipment via the control head's on/off/volume control knob, and then remove the main
power fuse near the battery.
CAUTION
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