How To: Aftermarket radio wiring with stock SVT sub and amp. - Focus Fanatics
Ford Focus Forum
HomeContact UsAbout UsGalleryDiscussion ForumsMarketplace

Go Back   Focus Fanatics > Ford Focus Tech Discussions > Car Audio, SYNC, MyFord Touch & Electronics

Car Audio, SYNC, MyFord Touch & Electronics The Forum for the Ford Focus audiophiles. The place to chat about automobile sound systems, security systems, or show off your I.C.E.!
Sponsored By: GT Sound Control

Search This Forum | Image Search | Advanced Search    
Ford Focus Tire & Wheels FocusFanatics Merchandise

Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 01-23-2008, 11:16 PM   #1
Detailing Freak
MattZX3's Avatar
Join Date: Dec 2005
Fan#: 30258
Location: Chicagoland, IL
What I Drive: 2012 Nero Black, Fiat 500 Sport

Posts: 348
FF Reputation: 23 MattZX3 Great Standing Member
Buy-Sell-Trade Rating: (4)
How To: Aftermarket radio wiring with stock SVT sub and amp.

Hey, just wanted to post this up for all of you svt guys, helped out another member on here with this wiring.

If you want to replace the audio-pile with an aftermarket, but want to retain the stock sub, follow this wiring and you should be all set

When installing a deck in a 2003 Focus SVT I was able to integrate the factory sub amp using the extra 7 pin plug from behind the factory radio. the wiring in the plug is as follows:
white/red- amp turn on (6volts)
white/black- column control(resistance)
brown/yellow- column control (power)
white/black- pre amp output (+)
grey/black- pre amp output (-)

I used a 249 OHM resistor to drop the amp turn on (white/red)voltage so that the sub doesn't pop when the radio is turned on/off. Using a male RCA connector, you can wire into the low level factory input wiring (white/black,grey/black) so that it will accept the female sub output on the aftermarket radio.

Make sure that the new deck has an adjustable/low-pass sub out, or you will need an adjustable crossover. Good luck, and have fun!!

Step 1:
Cut the RCA cable in half and strip it like this: The white area is the positive and the other area is negative.

Step 2:
Cut two 1-foot (1 Red, 1 Black) of 16-gauge wire and connect it to the spliced RCA wires from Step 1. Red with positive and black with negative. Note that the RCA end will plug into the sub output from your receiver.

Step 3:
Cut another 1-foot of 16-gauge BLUE wire and connect it to the red and white wire. This wire is for the remote (turns your amp on and off with the ignition position).

Step 4:
Cut another 1-foot of 16-gauge RED wire and connect it to the black and white wire. This wire is for the positive sound input.

Step 5:
Cut another 1-foot of 16-gauge BLACK wire and connect it to the black and grey wire. This wire is for the negative sound input.

Step 6:
Now you would connect the Red & Black wires together from Step 2 to Step 4 & Step 5. (Which completes the sound inputs)

Step 7:
The BLUE wire from Step 3 needs to be connected to the remote switch wire from your deck (This color varies depending on your head unit model, consult your owner's manual). If you get a popping noise then you will need to install Resistor between the two to lesson the load.

MattZX3 is offline  
    Reply With Quote

Bookmarks & Social Networks
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -5. The time now is 05:50 PM.

Copyright 2002-2014 All Rights Reserved : Terms of Use : Privacy Policy : Advertise Information

Focus Fanatics Ford Focus Forum offers many fun ways for you to engage with other Ford Focus Owners from across the world. Whether it be about the aftermarket performance modifications, technical how-to's, European tuned suspension or awesome fuel economy similar to the Acura TLX or Fiesta ST. You can find all Ford Focus and Focus ST related information here. Join our Ford Focus discussion forums and chat with local Focus enthusiasts in your area.