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Detailing Freak
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Discussion Starter #1
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/green-
yellow/brown-
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.
 

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Detailing Freak
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348 Posts
Discussion Starter #3
i unfortunately do not...


i do believe another member or two have used this wiring, so hopefully they either have pics, or can pull the radio out to take some pics
 

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Aftermarket radio wiring with stock SVT sub and amp.

After searching around for wiring info for the stock SVT sub and amp, and unable to find any usable info. I decided to make a small "how-to" for you guys.

Solder and shrink wrap wiring harness connections


Wrap wire loom around wire bundles (so it looks good)


Strip single RCA cable and twist core wire and shield wire like shown.
Solder "male" spade connector to blue/white wire.


Solder Blue/White wire to the White/Red wire.
Solder RCA core wire to the White/Black (+) wire.
Solder RCA Shield (negative) wire to the Grey/Black (-) wire.


Shrink wrap connections


Will update with more pics of the sub wiring harness later.

If anyone has any questions I will answer them as best I can.
 

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Detailing Freak
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348 Posts
Discussion Starter #5
look about two or three thread up and i posted about it, im actually going to merge those threads, because you have pictures..

when i did the install, i didnt take any pics.. so ill merge the two threads together
 

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Just my luck, now i gotta buy a stuiped crossover..... and now i got to hope and pray that i dont screw up this simple wire job.
 

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Obama Can't Gymkhana
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Okay... Ive Got a Problem I Guess.. So I am Connecting the Gray/black and white/black to the RCA and the white/red to the Blue/white that is on the harness adapter? Help me out here...
 

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Detailing Freak
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348 Posts
Discussion Starter #12
white/red = remote turn on. some decks its blue, some its blue and whits, should be labeled though

the remote wire is on the harness for the aftermarket deck
 

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I love it!
 

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I sure can. How would I post the pics up on this site?? I will take a bunch tomorow of the stock HU and the wiring in the dash for ya. I was told by the stero shop that the harness is compltely different between the 02 and the 03 and up cars. I used a Metra PN# 70-1770 wiring harness if that helps you at all. The wierd part is that the package says 1985-2004 which would mean that the stereo guy was wrong.
 

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Detailing Freak
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348 Posts
Discussion Starter #19
ah, there are three harnesses, one for the radio, which includes the power, ground, illumination, and the other is for speaker wires

there is a seperate harness that is for the sub only, but get pics, and ill let you know what you need to do

as for posting the pics, i use photobucket.

its a free site for hosting images, you can upload them, and then when they are uploaded, it will give you a link to copy and paste, right into the text box of a post
 

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I have an 02 SVT also...

I have an 02 SVT also and i've missed my sub since my Audiophile broke and i got an aftermarket stereo.
I always thought the 3rd harness was for the steering wheel controller so i left it hanging.
I'm anxious to know how to do this also so i'm going to take a picture of the 3rd harness for you tomorrow and post it ASAP.
Another problem i'm having is i just bought a Pioneer DEH-P5000UB head unit and i just installed it today, the plastic dash adapter i was using with the last stereo fits except i can't use it because the faceplate opens downward so you can put a CD in and the adapter is keeping it from opening. Is there an adapter that fixes this problem? I asked an installer at Best Buy and he said this is a problem with Foci and VW's but he never heard of a solution.
Thanks.
-Brett
 
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