Ford Focus ST Forum banner
1 - 20 of 288 Posts

·
Registered
Joined
·
150 Posts
Discussion Starter · #1 ·
These are simple instructions for hard-wiring a two-wire (no remote screen or mute) radar detector in just a few minutes without removing any trim panels.

I am using a Whistler CR85 which comes with a set of hard-wiring wires in the box with a 2 amp in-line fuse.

What you'll need:

  • Mini add-a-circuit fuse kit (any auto parts store)
  • A 2 or 3 amp mini fuze (depending on the RD - check the fuse inside the cigarette lighter plug)
  • Needle-nose pliers or a fuse puller.
  • A set of wire crimpers to connect your RD power wire to the Add-a-Circuit
  • A 5/16 inch wrench.
  • Opposable thumbs.


1) Mount the radar detector to the windshield under the mirror. This is the ideal location. You have the least obstruction from pillars in the car to maximize your range and the optical height for radar and laser.

2) Pull the power wire straight up and gently pull down the headliner and begin to tuck the power wire behind it. You should not be pulling loose any type of glue or fasteners. Continue to tuck all the way to the passenger A-pillar.

3) The plastic trim for the A-pillar overlaps the headliner material. Your wire will come out underneath the headliner. Tuck the power wire DOWN over the top of the plastic trim piece. Again, no un-fastening of any clips.

4) Follow across just a few inches and you'll come to the rubber gasket for the passenger door. Simply lift it away and tuck the wire behind that rubber, following it all the way down the door to the level of the bottom of the dash.

6) Remove the passenger fuse panel cover by removing the two nipples that hold it on.

5) There is the seam of another piece of trim. Tuck your wire UP underneath that seam and over the to the left where it will come out under the dash into the fuse box compartment.

7) Use the 7/16 in wrench to loosen the bolt that secures the lower dash. You can ground here. Tighten it back.

8) Follow the instructions for the Add-a-Circuit to connect your wire to fuse 85 on the fuse block. This is the fuse for the heated seats and will only receive power then the ignition is on.

9) Tie your wires back and replace the cover.

Done.

See photos.

Vehicle Car Vehicle door Automotive exterior Hood Vehicle door Automotive exterior Vehicle Windshield Automotive window part Red Vehicle door Vehicle Car Rim Vehicle Car Bumper Auto part Family car Electronics Technology Electronic device Electronic component Electrical wiring
 

·
Registered
Joined
·
142 Posts
Nicely done -Thanks for taking the time to do this- great info!
 
  • Like
Reactions: N2Focus

·
Registered
Joined
·
150 Posts
Discussion Starter · #4 ·
Hope it's helpful. I saw lots of people nervous about removing the A-pillar trim when it's not even necessary..

Now I need a dark gray adhesive track to hide the wire against the glass.
 

·
The Mod with a Mouth
Joined
·
9,494 Posts
Hope it's helpful. I saw lots of people nervous about removing the A-pillar trim when it's not even necessary..

Now I need a dark gray adhesive track to hide the wire against the glass.
what about putting it in the headliner
 

·
Registered
Joined
·
117 Posts
Just a quick question.. Don't police in the states have Radar Detector Detectors?

I am asking from the point of view of someone living in Australia.
 

·
Registered
Joined
·
150 Posts
Discussion Starter · #11 ·
Just a quick question.. Don't police in the states have Radar Detector Detectors?

I am asking from the point of view of someone living in Australia.
I think technology like that exists, but it's only a concern in states where radar detectors are illegal. I live in Texas where they are legal, so they can detect my detector all they want. :)

Sent from my Galaxy S4
 

·
Registered
Joined
·
20 Posts
Want to wire in USB power? Of course you do. A lot of dash cams and radar detectors run off of USB so lets give that a shot!

Buy one of these.

Amazon.com: SMAKN Dc/dc Converter 12v Step Down to 5v/3a Power Supply Module: Electronics

Buy a long USB cable. If your radar detector/dash cam comes with a cigarette lighter/12v charger with a long cable you can cut the cable off of the charger. Usually they are very long cables and you won't be needing the charging portion. Also the chargers usually suck anyways but the cable is fine. Strip the USB cable. You will probably see 2, maybe 4 wires. All you'll need to know are the black and red wires in the USB cable. The others are data and won't be used. Referenced google image below:

http://www.instructables.com/files/deriv/F84/VDZQ/FJX8VQ08/F84VDZQFJX8VQ08.LARGE.jpg

Reference above. The red USB cable wire is going to connect to the red of the output of the SMAKN Dc/dc Converter 12v Step Down to 5v/3a Power Supply Module and the black USB cable wire to the yellow of the SMAKN Dc/dc Converter 12v Step Down to 5v/3a Power Supply Module. The red input on the SMAKN Dc/dc Converter 12v Step Down to 5v/3a Power Supply Module is going to connect to the add a fuse wire. The black input wire on the SMAKN Dc/dc Converter 12v Step Down to 5v/3a Power Supply Module is going to go to a ground one of the bolts mentioned by the OP.

The bare minimum you'll need for this project:
Add a fuse: ATM Add-A-Circuit KIT. This KIT includes ATM Add A Fuse (same function as Bussmann BP/HHH) and 4 Bussmann ATM fuses (ATM-2, ATM-5 and ATM-10, ATM-15) : Amazon.com : Automotive
Power supply: Amazon.com: SMAKN Dc/dc Converter 12v Step Down to 5v/3a Power Supply Module: Electronics
Wire strippers: Paladin Tools 1118 GripP 20 Wire Stripper/Cutter, 30-20 AWG - Amazon.com
Crimp Kit: Neiko 175 Pieces Solderless Wire Terminal & Connection with Wire Stripper Crimper Tool - Amazon.com
Electrical tape: http://www.amazon.com/gp/product/B00004WCCL/ref=oh_details_o04_s00_i02?ie=UTF8&psc=1

I really advise getting a multimeter so you know you've wired the SMAKN Dc/dc Converter 12v Step Down to 5v/3a Power Supply Module correctly:
INNOVA 3300 Hands-free Digital Multimeter (10 MegOhm) : Amazon.com : Automotive

Wire Electronics Cable Technology Electronic device
 

·
Registered
Joined
·
210 Posts
The suction cups doesn't work well on the shaded part of the windshield because of the rough surface. You can cover it with clear tape and the suction cups will work like a charm.
 

·
Registered
Joined
·
67 Posts
Did this myself last night. Works quite well. I sort of got lazy though and didn't use an add-a-circuit. I just cut the wire and wrapped it around the heated seats fuse and plugged the fuse back in. Needless to say it works well and the wires are well hidden and sealed off. Thanks for the write up
 

·
Registered
Joined
·
150 Posts
Discussion Starter · #16 ·
Glad it helped! Be sure you tapped the right side of that fuse or the circuit won't be protected.

Sent from my Galaxy S4
 

·
Registered
Joined
·
275 Posts
Great write up. Install of my Escort MAX was VERY easy while not tapping in to factory wiring!

I can't stand seeing wires, so I went for the low profile look. Might limit rear radar some, but it still picks them up to my liking.






Sent from my iPhone using Tapatalk
 
  • Like
Reactions: 13Disciple

·
Registered
Joined
·
227 Posts
These are simple instructions for hard-wiring a two-wire (no remote screen or mute) radar detector in just a few minutes without removing any trim panels.
Just gotta say I really appreciate this write up. I'm adding my V1 and an auto-dimming review mirror with home-link, and was looking at a lot of options for tapping some power from the car. I ended up doing what you have done with the add a circuit doohicky.

So from my Focus to yours, thanks a bunch man, the install looks very clean, and I didn't have to tap into any wires - I could return it to stock in an afternoon. Brilliant!
 
1 - 20 of 288 Posts
Top