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If you are the Pied Piper I will follow. Just because it may be impossible, that is no reason to quit. I too wish to hard wire the mp3 player, however, I also wish to install a 1/8" mini jack into which my rider can plug her earphones. I wish for her to be able to continue to listen to her radio through the phones while I listen to my mp3's through the speakers. I know that it sounds convoluted, but I am the driver and cannot use the phones, yet I am the one that wants to listen to mp3's and not have the exterior dash all yucked up with wires and gizmos. Sooooo, when you get it figured out, or if you have a question please pm.
I am the guy who once made a bunch of orange crates out an airplane, so my skills are not to be trusted.
cm