75 WX/Firestik II Install
Cobra 75WX CB Radio
4’ Firestick II Antenna
Firestik Adjustable Stainless Steel Channel Mount Mini Kit (MK-274-R)
6-gang Auxiliary Fuse Box
Self-tapping Aluminum Phillips head screws
14-16 Gauge Plug/Ring Connectors
14-16 Gauge Positive and Negative Wire
12 Gauge Positive Wire
12 Gauge Ring Connector (2)
Heavy Duty Stainless Steel Spring (SS3-H)
Firestik External Quick Disconnect (R1-A)
drill and drill bits
Philips Head Screwdriver
Soldering Iron w/ Solder
I am providing this write up for illustrative purposes
only. Perform at your own risk. Any mods (including this one) you perform
on your vehicle is your responsibility. Furthermore, commercial use
of this write up is prohibited---all images and text are property of
4Runners.org. Linking or copying any portion of this write up may result
in legal action.
I've re-mounted this original hood channel mount to the rear
of my 4Runner in the rear cargo hatch area. Please click
here and see if this hear mount is better for you.
On the trails, a CB radio is indispensable for communicating
with your off-road friends. On the road, a CB radio can be just as valuable
for communicating with other drivers and truckers by exchanging information
on road conditions, exchanging alternate route information, reporting
the location of highway enforcement, etc. One of my friends who makes
cross-country trips as a big rig driver says that just by talking with
other drivers keeps him fresh and alert. A definite plus for all drivers.
thanks to Mertzr (Tom) for his help and advice on installing my CB.
His knowledge was invaluable to my write up.
Step 1: Mounting the Connector Box
Select an accessible location for this connector box. Doing so will
allow you to easily plug/unplug the CB unit. Also when you have your
CB tuned, choosing an easily accessible location will allow the tuner
to easily tune your unit. My tuner advised me that he would charge more
if he had to remove panels, wires, etc. Thus, I also chose to mount
my CB where mertzr (Tom) mounted his:
from the driver's side, in front of the shifter
connector box mounted
driver’s side, I put the Connector Box up against the black frame
(shown above) that supports the center console. With a pencil, mark
two holes for the mounting screws. Drill two pilot holes and then using
the supplied self-tapping metal screws, screw in the Connector Box to
the black frame.
I inadvertantly pulled out the panel plug (see the big hole)? If you
do the same, the part number to replace this little plug is 90467-07041-E0.
2: Drilling a Firewall Hole
You’ll have to consider how you will run your coax as
well as the positive/negative wires from the Connector Box. You may
choose to try to poke a big hole and run the coax and positive/negative
wires through the existing firewall grommet (located on the passenger
side footwell) or drill a new firewall hole. I chose to drill a new
firewall hole because I added an auxiliary fuse box inside the engine
compartment for future accessory wires.
it easy to drill this new firewall hole, remove the driver's side panel
(A), the doorsill trim plate (C) and the driver’s side footwell
trim panel (B). Set all pieces aside.
the four 10mm bolts to release the panel
four screws on trim panel (C); pull out trim panel (B)
the firewall padding clip and then fold and tuck it underneath to expose
the bare firewall. You will also need to unplug the clutch connector
(if you have a 5-speed). Next, drill a pilot hole and use progressively
larger bits to drill a ½” hole. You may need to use an
extension. Debur the hole and then insert a ½” rubber grommet.
and fold the carpet back to expose the firewall. Drill your new
firewall hole here...
is approximately where the hole will come out.
Step 3: Mounting the Hood Mounted Antenna Bracket
The gap between your quarter panel and hood may vary a bit from front
to back. Thus, dry fit your mount and securely mount with the 5 self-tapping
somewhere along this area
3 of the 5 self-tapping metal screws mounted
are a total of 5 holes in the mount. Mark the screw holes and then drill
the pilot holes. You can then fasten the bracket down with the supplied
self-tapping metal screws. When closing the hood, if the fit is tight,
try using felt stick-on pads or tape the bracket itself. Mine is rubbing
so I will have to put some felt on later.
Step 4: Preparing the Coax Connection
The Channel Mount Mini Kit includes 18’ of coax cable and the
hardware to complete this task. WARNING:
Whatever you do, do NOT cut the coax cable even if you
need only half of it! This is the optimum length for the coax for CB
operations. Don’t ask me why---the experts say so and I’m
not arguing with them.
coax cable from the outside and run the unthreaded end through your
new firewall hole. Go inside and carefully pull the coax through, leaving
about 1 to 2 feet inside the engine compartment.
take your threaded barrel connector, slide it on the coax, and then
push the coax onto the barrel connector. Slowly twist it in so the tip
of the coax is at least even with the tip of the connector. Use some
solder to secure the connection. After the solder has dried, screw the
connector into the back of the power box.
threaded barrel connector (A), push and thread. Then take barrel
connector (B) and slide over top
will be a space around the wire coming out of the coax and the tip
of the barrel connector (A). Add some solder into this space/gap
for a good connection
Step 5: Attaching the Coax to the Antenna Mount and the Connector Box
Screw the coax and hardware onto the antenna mount with the
supplied parts from the Mini-kit. See the picture below.
also have quite a bit of coax on the other end in the passenger compartment.
I chose to run the coax under the driver’s side doorsill trim
plate under the driver’s seat (12” skein-like coil), under
the center console (towards the radio) and connect to the Connector
top to bottom: Double-ended antenna nut, lock washer, plastic spacer,
antenna mount, coax, and large nut.
the coax under the door sill trim plate, wrap excess coax under
the seat in a "skein-like bundle", and then run the remainder
under and towards the connector box under the center console.
the end of the coax to the Connector Box.
Step 6: Making the Power Connection
I chose to connect my Cobra CB to an auxiliary fuse box. Make sure you
unscrew and unplug both the positive and negative connection to the
battery before going forward.
ring connector shown will attach to your (+) battery terminal. This
is protected by a 30 Amp in-line fuse. Use a butt connector and
crimp a 10 or 12 gauge power wire. Protect with electrical tape
or heat shrink tubing.
crimp on a ring-type connector to the end of your 30 amp in-line fuse
connector. On the other end, use a butt connector and crimp on a 10
or 12 gauge positive power wire. On the other end of this positive wire,
crimp on a ring-type connector. You will attach this onto your auxiliary
the Buss auxiliary fuse box mounted inside the engine compartment
firewall. Notice the 12 gauge power wire running from the battery
and to the auxiliary fuse box
installing the auxiliary fuse box, go back to the connector box and
pull apart the positive/negative wires apart from each other and run
the positive through your new firewall hole. Crimp on a 14-16 gauge
plug-type connector to the (+) wire and then plug it into one of the
blades on the auxiliary fuse box. Put in a 15 amp fuse too.
on a 14-16 gauge ring connector to the (-) wire and ground it to a bare
metal section on the firewall. I chose to mount the negative wire near
the footwell trim panel.
Step 7: Mounting the Antenna and SWR Tuning
At this point, the install is almost complete. Screw on the spring mount
onto the end of the Firestik and then screw it onto the antenna mount.
Tune the antenna by testing the SWR. If you are inclined to do so and
have the right tuning equipment, by all means, do it. However, if you’re
a newbie like me and want a pro to do it, look up “CB” or
“Scanner” on your local internet pages and find an expert.
My tune cost $15 though I’ve heard cheaper prices from other members.
My test took only 10 minutes and got a 1.5 reading on Channels 1, 19,
storing your Firestik when not in use, Mertzr (Tom) stores his here:
Clip on the headrest clips and drop your Firestik right
Firestik has some excellent articles on…well, just about everything
and anything you want to know about the CB world. I would highly recommend
you read ALL their articles here.
or feedback? Email me and I'll try to get back to you. If this article
helped you save time, money or just made things more convenient
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