Anybody figured out how to hard wired a MP3 interface, I don't want use a FM modulator or cassette interface, to a factory double DIN cassette deck/radio in a '99 Tracker?

Thanks

I just looked into this (and Bluetooth) very deeply over the last couple months. 

Ended up buying a new stereo.  There were no painless alternatives.

I went with Clarion CX609, but the JVC KW-XG700 and Pioneer FH-P8000BT were in the running.  Decided I wanted the USB input on the rear, not on the front.

What you are looking for would involve removing the radio, buying a schematic for it, then soldering a connector at the "appropriate point" in the Audio Frequency section of the radio's circuit board.  If you are extreemely lucky, know lots about electronics and can actually find a copy of the radio's circuit board schematic - the mod might work...

... or you can do what beercheck suggested and buy a new radio that has those features.   I had a CD/radio in my '93 Sidekick that also had an audio input port.   It worked great - and I could play MP3 CDs with hours and hours of music on them.  I used the MP3/audio input port to turn the radio into a PA system.

All the above without once heating up the 'ol soldering iron!

I hope that this helps!

My ipod is attached to a device that transmits my Ipod music through fm frequency onto my radio

VideoYug - 3 in 1 Car Kit

youtube link they also have a zune one.......I dunno what your really trying to do but I found this to be the easiest way for me to get video music and podcasts into my car without spending big $$$$ cost only 13 dollars.......of course you need and ipod of some sort.......no ipod there could be a headphone fm transmitter that will transit anything with a headphones output onto your radio dunno is that exists though............plugs into your lighter for power