**This is actually kind of old, but saw the other poster's thing here and thought this might help some people**
Write Up: Amp + Sub with Factory Stereo
I installed an amp and sub today and connected it to my standard factory radio. I do not have the Infinity sound system just to be ultra clear. I used a PAC SNI-15 to wire my amp up and connected it to the speaker wires on the radio harness right behind the head unit.
Here's a couple of things you might find handy during your install.
Add a straightened hanger to the plan!
Start out by opening your hood and taking the positive battery terminal off so that you're dealing with a dead vehicle. I like to lay my hood back against the windshield so I have plenty of room.
Next come back into the Jeep and take out your stock radio. You can do this by following these steps:
1. Use a medium sized flat head screw driver on the forward most corners of the top of the dash. This panel will pop up and then slide forward and off. Its simple, just use some force.
2. Use your screwdriver again on the lower most panel that on 07/08 is just blank on X models. 09/10 has a net thingy here. Pry it from the top and it will pop out with a little force.
3. Use a small socket (sorry I didn't check size, maybe a 6mm?) and remove the four little screws. Two in the top, two in the bottom. This will free up the rest of the panel that holds all of your A/C controls ect. Pull it. Just do it. Keep pulling on it. Its gonna pop off but you're gonna have to pull on it.
*NOTE* I did not remove this completely, I just got it out of the way enough to get my head unit free.
4. Use your small socket again and remove the four screws holding your head unit in place.
Once you have all of this done you'll want to reach behind the head unit and remove the PIN connector. Just leave the Sirius and FM antenna connected and set the radio on the dash to the right, over the glove box. You'll see the radio here and the harness you're going to be playing with.
Now take the PIN connector and take notice how it is routed back behind the metal in the picture below. You're going to want to pull it behind there and bring it out in front of that metal bar. This is going to give you more room to work with the wiring. I've included an awkward picture trying to show you what I'm talking about.
The wiring is covered with a black fabric and you'll need to cut the tape off of it so that you can access the wires. You'll find more tape holding the wires together beneath that which you'll also want to remove. This stuff is STICKY so get a damp towel out so you're not sticking to everything.
CONNECT THE PAC OR LINE LEVEL CONVERTER:
I'm gonna make this REEEAL easy for all of you guys so you don't have to go decipher a PIN plan out or anything like that. K? K.
Go get into your Jeep and get comfy, you're gonna be here for a few minutes.
I purchased my connectors at Radio Shack (who was hiring, now sells T-Mobile, and connectors were free with purchase of a flat screen...) for $1.99.
You're going to use the following wires for this (They are twisted together, you'll have to untape them and play with them to get some room for your connectors.) These are the wires you're going to use no matter what model your level converter is....
RIGHT FRONT speaker wires:
+ (positive) Dark Green with a Violet Stripe
- (negative) Dark Green with a Yellow Stripe
LEFT FRONT speaker wires:
+ (positive) Gray with Violet Stripe
- (negative) Gray with Yellow Stripe
This is a photo of ALL of the wires on the factory PIN harness:
These are the wires you're going to use: