Control Head Power Cable Installation - Harris M7300 Installation And Product Safety Manual

MM-014763-001, Rev. E
are located near the center of the radio's rear panel. Figure 8-7 on page 56 shows the two CAN port
connectors on the control head's rear panel.
8.3.3.2 Make CAN Link Terminations and Cable Connection
Follow this procedure for an installation which has only one control head. For a multi-control head
installation, refer to Figure 8-11 as necessary.
1. Mate a CAN Terminator (item 5 in Table 4-4 on page 22) with either one of the two smaller 3-pin
CAN port connectors on the rear panel of the CH-721. This action makes the CAN termination at the
control head end of the CAN link.
2. Obtain a CAN Cable and mate it to the other CAN port connector on the rear panel of the CH-721.
Typically, item 6 in Table 4-4 is utilized, a 30-foot CAN cable.
3. Route the cable through the vehicle's interior wire/cable channeling to the radio. Remove interior
panels, door kick panels, etc., as necessary. Protect the cable from possible chafing as necessary.
4. Mate this other end of the cable to one of the two CAN port connectors on the rear panel of the radio.
5. Mate another CAN Terminator to the other CAN port connector on the rear panel of the radio. This
action makes the CAN termination at the radio-end of the CAN link.
6. Loop, tie and stow the excess cable as necessary, leaving a service loop at the back of the radio and at
the back of the control head.
8.3.4

Control Head Power Cable Installation

Plan the route of the control head's DC Power Cable carefully. Do not route the cable where it will be
damaged by heat sources or by casual contact, and protect it from wire chafe per standard installation
methods. The following procedures are recommended:
8.3.4.1 Install DC Power Cable and Make Power and Ground Connections
1. Connect the control head's DC Power Cable (item 4 in Table 4-4 on page 22) to the large 3-pin
connector at the rear of the head. Visually align the key and gently push and turn the outer locking
ring clockwise until it stops. A click will be sensed to confirm proper mating.
2. At the back of the control head, locate a nearby section of vehicle chassis ground and strip this area of
any paint or dirt to expose a bare metal surface.
3. Cut the black wire of the control head's DC Power Cable to the required length, plus a service loop of
at least six (6) inches, then strip it and crimp a ⅜-inch ring terminal to it. Two ring terminals of this
type are included with the cable.
4. Drill a hole as necessary and attach this ring terminal to chassis ground. Use stainless-steel self-
locking hardware (i.e., machine screws with washers and locking nuts) or other appropriate hardware
to ensure a reliable terminal-to-metal contact. Tighten securely.
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When mating any CAN connection (terminators and cables) to a rear panel connector,
visually align the ¾-moon-shaped keys of the connectors, and then gently push and
turn the outer locking ring of the plug (male) connector clockwise until it stops. A mild
click will be sensed to confirm proper mating. Without visual alignment as a guide, it
is possible with excessive force to mate the CAN connectors improperly. Damage to
the connector(s) may result. Therefore, visual alignment is recommended when mating
CAN connectors.