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

Go Back   Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum > 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    
FocusFanatics Merchandise

Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 09-03-2010, 07:33 PM   #11
Focus Addict
6SPD_soul's Avatar
Join Date: Feb 2008
Fan#: 53637
Location: Soldiers Grove, WI
What I Drive: 2003 Comp Orange EAP SVT

Posts: 1,468
Points 2,489, Level 30
Points: 2,489, Level: 30 Points: 2,489, Level: 30 Points: 2,489, Level: 30
Level Up 26% Completed
Level up: 26% Level up: 26% Level up: 26%
Forum Activity 0%
Activity: 0% Activity: 0% Activity: 0%
FF Reputation: 24 6SPD_soul Great Standing Member
Buy-Sell-Trade Rating: (1)
Rick I just did this today and it was surprisingly easy once you get it straight in your head how to do it. The car sounds SO MUCH BETTER with real bass. The easiest way to clarify this is by looking at this picture:

First off, the wiring plug on the far right is the one that controls the sub+amp and steering wheel controls, and the one you mostly need to deal with. The 2 wires at the far right end of the plug that are kind of intertwined are the preamp output positive and negative wires. These are the ones that need to get spliced with the RCA wires as illustrated elsewhere in the thread, and the normal RCA plug goes into either the left or right rear output plug on the back of the head unit.

The fifth wire from the right end of the same harness is the amp on wire, it's white and red. You need to bridge a wire from that all the way over to one of the blue wires on the opposite side of the screen, the far left harness lower plug. Mine was the left most wire and was labeled as amp on or something to that effect, but I remember mine being solid blue as opposed to the blue/white you see above. "Amp on" was printed directly on the wire. If you wanted to use a resistor as described by Matt, it would go into the wire bridging the two amp on wires, but I skipped it and don't really hear any "pop" when the car is turned on, so I don't know what benefit there would be in putting a resistor inline. Also this bridging wire is where you could use a spade type connector as illustrated above so it will all come apart cleanly, but I just used a single wire. I can always put a spade connection in later. If your deck has a menu for adjusting separate sub volume then you don't need to worry about the crossover stuff mentioned above.

I didn't take any pictures, but I did make a crude photoshop illustration of all this using the above picture and can send it to you if you want it. It's got helpful arrows and whatnot. This thread was helpful and concise also but disregard what he says about the yellow/brown wire. The RCA wires need to go to the preamp output + / - wires and they are white/black and gray/black, in that order.
6SPD_soul is offline  
    Reply With Quote

Bookmarks & Social Networks

Quick Reply

Register Now

In order to be able to post messages on the Ford Focus Forum, Ford Focus ST Forum, Ford Focus RS Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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 07:01 AM.

Copyright 2002-2014 All Rights Reserved : 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 Audi S3, Ford Fusion and Acura TLX. 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. Challenger Hellcat - Charger Hellcat