Radio Mounting; Mounting Trunnion; Standard Mounting Trunnion; 3-Point Mounting Trunnion - Motorola GTX Installation Manual

Installation

Starting The Installation

Radio Mounting

Mounting Trunnion

The mounting trunnion allows the radio to be mounted
to a variety of mounting surfaces. Be sure the mount-
ing surface is able to adequately support the weight of
the radio. Allow sufficient space around the radio for
free air flow for cooling. Be sure the unit is close
enough to the vehicle operator to permit easy access to
the operating controls.
CAUTION
Do not mount the trunnion to a plastic
dash board. In an accident, the radio
and trunnion could break loose and
b e c o m e a p o t e n t i a l fl y i n g h a z a rd .
Always secure the trunnion to the metal
support frame of the dashboard.

Standard Mounting Trunnion

The standard mounting trunnion should be used for
installing only the low power (12 W and 15 W) radios.

3-Point Mounting Trunnion

The high power (30 W and 35 W) radios must be
installed with the 3-point mounting trunnion.
Starting The Installation

DC Power Cable Installation

The radio must be operated only in negative ground
electrical systems. Reverse polarity does not damage
the radio however, radio protection circuits cause the
cable fuse to open. Check the vehicle ground polarity
before you begin installation to prevent wasted time
and effort.
The 3 meter (10 feet) UIC power cable shipped with the
radio is long enough for installation in most vehicles.
Begin the power cable installation in the following
manner.
1. Determine a routing plan for the power cable
with reference to where the radio is to be
mounted.
2. Locate an existing hole with a grommet in the
vehicle firewall, or drill a 3/8" access hole at
the location for passing the power cable into
the engine compartment. Install a grommet
with a 1/4" (7mm) inner diameter in the
access hole to avoid damage to the cable.
CAUTION
High degree of care should be exercised
not to damage any existing vehicle
wires.
2-2
3. From inside the vehicle, feed the red and
black leads (without lugs attached) through
the access hole and into the engine compart-
ment. See Figure 2-1.
To Radio
Red Lead
Figure 2-1. Power Cable Routing into the
Engine Compartment
4. Locate the nearest available vehicle chassis
ground mounting point and shorten the black
lead to remove excess cable length.
5. Install ring lugs (supplied) onto stripped end
of power cable black lead, and onto stripped
end of the red lead on the fuse holder. See
Figure 2-2.
To prevent a possible fire due to an acci-
dental short along the power cable,
always install the power cable with the
fuse holder.
6. Locate the fuse holder as close to the battery
as possible and away from any hot engine
components. Mount the fuse holder using the
provided mounting hole and dress the wires
as necessary. Connect the fuse holder red
adapter lead to the mating receptacle on the
red lead of the power cable. See Figure 2-2.
Adapter
Red
Lead
Firewall
Black
Lead
Figure 2-2. Power Cable Assembly
7. Connect the power cable black lead directly to
the vehicle chassis ground.
6880907Z66-O
GTX Mobile Radio Installation Manual
Black Lead
Firewall
Engine Compartment
CAUTION
Red
Lead Fuse
Cover
Molded In-Line
Mounting
Fuse Holder
Hole
Ring
Lugs
To Vehicle
Chassis Ground
Grommet
Red
Lead
To
Battery (+)
June, 2000