RE: Cheapest way to install aftermarket CD deck
There's something about that FDK10 harness that lowers the output of the Pioneer deck, I THINK. Don't take my word on that. This is basically what I did, step-by-step.
1. Disconnected the negative terminal on the battery
2. Removed the factory radio using the two U-shaped hook tools
3. Unplugged the three connections from the back of the factory deck (one is the antenna wire)
4. Spliced the Pioneer harness into the FDK10 (you will have a few wires left over, like dash illumination and such. I think three or maybe four wires aren't used). The kit also comes with three hookups, you only use two. You'll see which ones are used.
5. Hooked everything up, the gray and green connector to the FDK10 and the antenna wire into the back of the Pioneer.
6. Mounted the deck and top plastic part. It doesn't screw in anywhere, so anybody could steal it very easily. If anyone knows how to fix this, let me know!
7. Reconnected the battery.
Now, the first time I did this I forgot to splice and crimp one of the wires (the remote signal for the amplifier) but after I figured that out it sounded great. Hopefully this is the correct way of doing it, I don't want to ruin my stock amp. I do have the Premium sound (with eight speakers) so I'm not sure if the setup will be the same on all Marks.
Let me know if you need help!
About the subs, I'm positive it will be simple using the RCA outputs on the deck. I'm thinking about doing that but I need some more money first! Total cost for parts and self-installation, $181.89 (I retured the FAI-3A to CarDomain.com).