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i have a 2002 4runner with the stock radio and i am looking to replace it with a JCV head unit. do i need to take out the stock amp? what wire harnesses do i need? All the harnesses I've looked at only have wires for 4 speakers, i haven't seen any that says anything about the tweeters...
Good writeup here. I know Bob is still trying to get the site back up, but this will work for you.
http://web.archive.org/web/201212312...nit/index.html
There are a few things I would change about that writeup. Don't worry about running a separate power wire to the stereo, the factory one should be sufficient.
Don't worry about the tweeter, that is self contained within the front speaker (There must be a high pass filter on the factory speaker feeding the tweeter). It's been a long time since I did my speaker swap, so I don't recall how that is exactly handled by the stock setup, but it is, so shouldn't be a problem for you.
The wiring harness you need, assuming you have the JVC side of the harness is this: http://www.amazon.com/Metra-70-1761-...rds=%2370-1761
The wiring should be straight forward, read the manual on how to put the two harnesses (JVC to TOY) together. I HIGHLY recommend soldering the connections. If you can't do that, try to find someone who can, or use high quality crimps. Soldering is the better way to go though. If you live in SoCal, I'll solder it up for you.
Any other questions, feel free to ask! and WELCOME to the forum!