6
2.
To
attach
the
PTT
to
a
flat
surface,
remove
the
2
screws
from
the
bottom
of
the
PTT,
which
holds
the
Velcro
strip
in
place.
Remove
the
strips
and
replace
the
small
plastic
part
that
held
the
strips
in
place
with
the
larger
flat
plastic
part
supplied
with
the
PTT.
Screw
the
new
plastic
part
in
place.
3.
Feed
the
cable
out
of
sight
to
the
location
where
you
intend
to
mount
the
junction
box.
Caution:
Make
sure
there
is
sufficient
slack
in
the
cable
to
allow
the
free
movement
of
the
gear
lever
without
stretching
the
PTT
cable.
D.
Installing
the
Power
Cable
Caution!
The
Car
kit
should
be
used
with
a
negative
ground
electrical
system
only.
Reverse
polarity
(positive
ground)
will
trigger
protection
circuits
which
cause
the
cable
fuse
to
open.
Check
the
ground
polarity
before
you
begin
the
installation
to
prevent
wasted
time
and
effort.
12V
DC
or
24V
DC
automotive
systems
are
directly
supported.
Determine
the
best
cable
route
to
the
vehicle
ignition
for
the
Power
Cable
from
the
location
where
you
intend
to
mount
the
Junction
Box.
Diagram
4
1.
Route
the
black
lead
of
the
main
power
cable
to
a
convenient
chassis
ground
and
the
red
lead
to
the
positive
supply
voltage
connection
point.
If
it
is
necessary
to
penetrate
the
firewall,
try
to
use
an
existing
opening.
2.
If
there
is
no
existing
opening,
drill
a
new
hole
approximately
9/16”
or
3.5cm
in
diameter.
Make
sure
that
there
is
clearance
on
the
opposite
side.
Insert
a
grommet
into
the
hole
to
prevent
damage
to
the
power
cable.
When
making
connections
on
the
engine
side
of
the
firewall,
additional
in
‐
line
fuse
holder
(included)
should
be
used
at
the
connection
points.
GREEN
MUST GO TO IGNITION OR CONNECTED WITH
RED
Diagram
5
