Motorola Gm300 Installation Manual

							DC Power Cable Installation1-3
4.Connect the black lead of the power cable to the nearest vehicle chassis ground point (using
the provided ring lug if necessary). Shorten the black lead to remove any excess cable.
(See Figure 1-2 Power Cable Assembly.)
5.Place the fuse holder close to the battery. Ensure that it is not near any hot engine
component. Mount the fuse holder using its mounting hole and dress the wires as required.
6.Insert the stripped end of the red lead of the fuse holder into the ring lug hole and crimp it.
Connect the fuse holder red adapter lead plug to the mating receptacle on the red lead of the
power cable. (See Figure 1-2 Power Cable Assembly.)
7.Connect the power cable black lead directly to the vehicle chassis ground.
8.Connect the red lead ring lug from the fuse holder to the positive (+) battery terminal. Make
sure the adapter cable is connected to the main power cable red lead.
Carefully check that all connections are proper. Insert the fuse into the fuse holder and close the
cover. (See Figure 1-2 Power Cable Assembly). NOTE
Locate a good vehicle ground point. The vehicle frame provides the best ground. Optimum
radio performance can only be achieved with a very low resistance ground connection.
Verify that the connections between the battery negative terminal, vehicle chassis, and
engine block have low resistance.
Figure 1-2Power Cable Assembly
NOTE
Failure to mount the red lead of the power cable kit directly to the battery may result in
severe alternator whine interference.
Fuse
Cover
Red Lead Red Lead
Mounting
Hole Molded In-Line
Fuse Holder
To Vehicle
Chassis Ground Engine
Compartment
To Battery (+) Adapter
FirewallRed Lead
Black Lead
Ring
Lugs
FL0830247-O 
						

							1-4INSTALLATION
3.0 Trunnion Installation
3.1 Planning the Mounting Trunnion Installation
The standard mounting trunnion allows the radio to be mounted to a variety of surfaces.
1.Ensure the surface can support the weight of the radio.
2.Although the trunnion can be mounted to a plastic dashboard, it is recommended that the
mounting screws be located so they penetrate the supporting metal frame of the dashboard.
3.2 Trunnion Installation Procedure
1.Select either the transmission hump or an open underneath portion of the dash to mount your
radio. (See Figure 1-5 Transmission Hump Mounting (Top) and Below Dash Mounting
(Bottom)). When mounting the trunnion on the transmission hump, be careful that the
transmission housing is not affected.
2.Use the trunnion mounting bracket as a template to mark the hole positions on the mounting
surface. Use the innermost three holes for a curved mounting surface, such as the
transmission hump, and the three outermost holes for a flat surface such as under the dash.
3.Center-punch the spots you marked and use a 4 mm (5/32-inch) bit to drill a hole at each
location.
4.Secure the trunnion mounting bracket to the mounting surface with the three self-tapping
screws provided. (See Figure 1-5 Transmission Hump Mounting (Top) and Below Dash
Mounting (Bottom)).
5.Slide the radio into the trunnion. Secure the radio with the two thumb screws provided.
(See Figure 1-3 Radio into Trunnion.)
Figure 1-3Radio into Trunnion
Thumb
Screw Thumb
Screw
Trunnion
FL0830248-O 
						

							Antenna Installation1-5
3.3 Control Head Mounting Position
The control head is designed to be removed from the housing and turned to any position within a
180° radius. This provides multiple mounting options for the radio. For example, the radio may be
mounted on either side of the vehicle transmission tunnel to facilitate the safest and most
ergonomically ideal position. The control head may then be turned to provide the most convenient
access.
To reposition the control head:
1.Insert a small flat blade screwdriver, or similar instrument, in the recess between the control
head and the radio housing.
2.Press until the control head releases. Repeat the process on the opposite side of the radio.
3.Pull the control head away while ensuring that the flex connector remains attached.
4.Rotate the control head, and fold the flex circuit to align it to the new position.
5.Push the control head into the housing until the protruding tabs snap into place.
4.0 Antenna Installation
4.1 Mobile Radio Operation and EME Exposure
Observe the following caution and electromagnetic energy exposure (EME) statements when
installing antennas:
To assure optimal radio performance and that human exposure to radio frequency electromagnetic
energy is within the guidelines referenced in this document, transmitonlywhen people inside and
outside the vehicle are at least the minimum distance away from a properly installed,
externally-mounted antenna.
CAUTION: The contact surface of the flex circuit should be facing the printed circuit board.
CAUTION: Use caution when installing antennas with mobile radio equipment using
transmitter power in excess of 7 Watts.
NOTE
For low-power mobile radios (7 Watts, or less), there are no antenna type or
installation restrictions.
!
! 
						

							1-6INSTALLATION
The table below lists the minimum distance for several different ranges of rated radio power.
4.2 Selecting an Antenna Site
1.Install the vehicle antennaexter nalto the vehicle and in accordance with:
a. The requirements of the antenna manufacturer/supplier
b. Instructions in the radio installation manual.
2.The best mounting location for the antenna is in the center of a large, flat conductive surface.
In almost all vehicles, mounting the antenna in the center of the roof will satisfy these
requirements. A good alternate location is in the center of the trunk lid. If you use the trunk lid,
ensure that the trunk lid is grounded by connecting grounding straps between the trunk lid
and the vehicle chassis.
3.Ensure the antenna cable can be easily routed to the radio. Ensure that the antenna cable is
routed separately and not in parallel to any other vehicle wiring or mobile radio cable wiring.
4.Check the antenna location for any electrical interference.
5.If the vehicle is equipped with an electronic anti-lock braking system (ABS) and the antenna
will be trunk mounted, then install the antenna on the side opposite to the braking modulator
box. This minimizes radio interference to the modulator box from the radio.
6.Motorola offers a glass-mount antenna as an accessory. It is usually mounted on the rear
window. This antenna should be placed as high as possible on the vehicle. Ensure that a
rear-window defogger element does not touch the inductive “button” on the mounting foot of
the antenna.
7.Make sure the mobile radio antenna is installed at least 30.48 cm (1 foot) away from any other
antenna on the vehicle.
4.3 Antenna Installation Procedure
1.Mount the antenna according to the instructions provided with the antenna kit. Run the
coaxial cable to the radio mounting location. If necessary, cut off the excess cable and install
the cable connector.
2.Connect the antenna cable connector to the radio antenna connector on the rear of the radio.
(See Figure 1-4 Connections to the Back of Radio.)Ta b l e 1 - 2Rated Power and Distance
Rated Power of Vehicle-Installed
Mobile Two-Way RadioMinimum Distance from
Transmitting Antenna
7to15Watts30.5 Centimetres (1 Foot)
16 to 50 Watts 61 Centimetres (2 Feet)
More than 50 Watts91.5 Centimetres (3 Feet)
NOTE
Any two metal pieces rubbing against each other (such as seat springs, shift levers,
trunk and hood lids, exhaust pipes, etc.) in close proximity to the antenna can cause
severe receiver interference. 
						

							Antenna Installation1-7
4.4 Completing the Installation
1.Mount the microphone clip to a convenient spot near your radio.
2.Your microphone has a telephone-type connector at the end of its cord. Plug the microphone
into the control head connector.
3.To complete your radio installation, plug the power cable into the radio power connector.
(See Figure 1-4 Connections to the Back of Radio.)Figure 1-4Connections to the Back of Radio
Antenna 
Connector
To Battery
+ via Fuse
F1 (red)Power
ConnectorVehicle
Chassis
Ground
(black)
Accessory 
Connector Kit
FL0830249-O 
						

							1-8INSTALLATION
Figure 1-5Transmission Hump Mounting (Top) and Below Dash Mounting (Bottom)
Tab
BELOW DASH MOUNTING
Mounting Surface Mounting
Surface
Tab
Thumb Screw
(2)
TRANSMISSION HUMP MOUNTING
Tab
Thumb Screw
(2)
Sheet Metal
Screws
Trunnion Mounting
Bracket
Trunnion Mounting Bracket
1.84
(46mm)
2.92
(73mm)2.92
(73mm) 1.84
(46mm)1.12
(28mm)
FL0830250-O 
						

							Installation Options1-9
5.0 Installation Options
5.1 Radio Mounting in Dashboard
5.1.1 To Install the Radio in an Automotive Dashboard:
1.Open out the radio cut-out in the dashboard to ISO 7736 specification (182mm x 53mm).
2.Remove the Top plastic cover off the radio.
3.Insert the mounting frame into the cut-out and retain it by bending back the relevant fixing
tabs, using all 6 where possible, to hold it in place. Press the bezel onto the mounting frame.
5.1.2 To Mount the Complete Radio in the Frame:
1.Provide the electrical connections to the radio for power, antenna and accessories as shown
in Figure 1-4 Connections to the Back of Radio.
2.Plug in all the connectors and push the radio firmly into the mounting frame until the two
springs snap into place.
NOTE1. The tabs are easily bent back by twisting a large flat-bladed screwdriver in the slot
behind the tabs.
2. For a more secure installation the top and rear of the frame should also be secured
with screws.
3. The demounting tool can be used as an aid to mounting as well as demounting.
Figure 1-6Mounting the Radio into the Dashboard
DIN MOUNT
MOUNTING FRAME
RLN4782 TABS
DEMOUNTING TOOL
P/N 8164298B01
ZWG0130399-A 
						

							1-10INSTALLATION
5.1.3 To Remove the Radio / Remote Mount from the Frame
1.Push the two demounting tools (see Figure 1-6 Mounting the Radio into the Dashboard) 
through the openings in the frame until the two springs release the radio.
2. Slide out the radio.
5.2 External Speaker Installation
1. Remove the speaker from the trunnion bracket by loosening the two wing screws.
2. Choose a place to mount the speaker.
3. Use the trunnion bracket as a template to mark the locations of the three mounting holes.
4. Centerpunch and drill a 4 mm (5/32-inch) diameter hole at each location.
5. Mount the trunnion bracket with the screws supplied. (See Figure 1-7 Mounting the Speaker
Under the Dashboard.)
6. Insert the speaker into the trunnion bracket and tighten the two wing screws.
7. Insert the external speaker accessory plug into the accessory connector of the radio.
NOTE1. The  fi xing  tabs  should  b e c he cked  fo r  tig htne ss each  time  the  radio  is
removed. The tabs are easily tightened by twisting a large flat-bladed 
screwdriver in the slot behind the tabs.
2. The frame is not designed for daily mounting and demounting .
Figure 1-7 Mounting the Speaker Under the Dashboard
Dashboard
Firewall Trunnion Bracket
To
Firewall
Mounting
or
Dashboard
Firewall 10-16 x 5/8
Self-Tapping Screw
0.157 (0.399cm)
Diameter  Trunnion
Bracket
Console or Floor
FL0830253-O 
						

							Installation Options1-11
5.3 Remote Control Head Installation
5.3.1 Removing the Front Housing
1.Remove the Controlhead from the Transceiver by inserting the dismantling tool (Motorola part 
number 6686119B01) in the recess between the Controlhead and the Transceiver.
2. Split the Controlhead into Front and Back housings by inserting the dismantling tool in the
recess between them.
3. Remove the flex from the Transceiver only.
5.3.2 To Assemble the Remote Back Housing 1.Remove the twists from the flex and connect the flex from the Controlhead to the Remote 
Back PCB connector.
2. Align the speaker with the speaker support.
3. Press the Controlhead onto the Remote Back Housing until ALLthe tabs snap into place.
5.3.3 To Assemble the Remote Front Housing: 1.Connect the flex from the Remote Front Housing to the top small connector in the Transceiver.
2. Press the Remote Front Housing onto the Transceiver chassis until the chassis tabs snap into
place.
NOTE1.  T o  mi nimise  c o sm etic  d ama ge d is ass em ble  f r o m  t h e bo tt o m  s id e,  (la bel si de).
2. The Controlhead Back Housing is not required for remote mounting.
Figure 1-8Remote Front and Back Housings
NOTEFor correct orientation of the flex, align the ‘O’ on the flex with the ‘O’ on the PCB .
NOTEFor correct orientation of the flex in the Transceiver, the “plastic” tab should be up, 
contacts facing down. Align the ‘O’ on the flex with the ‘O’ on the Transceiver. The
flex must be pushed into the connector until it meets the stop.
1
2
3
456
75
4
8
ZWG0130204-O 
						

							1-12INSTALLATION
5.3.4 To Install the Remote Controlhead:
1.Position the Remote Mount Bracket (Item2 in Figure 1-8 Remote Front and Back Housings) in
the desired location and mark the positions of the mounting holes.
2.Centrepunch the marked spots and drill 4mm holes at each spot.
3.Fix the Remote Mount Bracket in position using the supplied screws.
4.Route the Remote Cable (Table 1-3) as required, feeding it through the bracket
(a 20mm hole is required for the cable plug).
5.Push the cable plug into the Remote Front and Back Housing until it snaps into place.
6.Snap the assembly into the bracket.
7.Adjust the assembly as required then fix it in position with the wing screws supplied.
Ta b l e 1 - 3Associated Components
Item Description Part Number
1Wingscrews0305760W02
2 Remote Bracket 0764275B01
3Remote Back Housing
(GM380/GM1280)
Remote Back Housing
(GM340/GM360/GM640/GM660)1564268B01
1564269B01
4 Remote PCB (2 off per kit) GLN7362
5Flex (2 off per kit)8486127B01
6CableKit3M
Cable Kit 5M
Cable Kit 7MRKN4077*
RKN4078*
RKN4079*
7Remote (Transceiver) Front Housing1564270B01
8 Dismantling Tool 6686119B01
* Cable Kits to be ordered separately.
NOTESpecifications are subject to change without notice.
Contact your Motorola dealer for the latest specifications.