I see that there were views on this post, but no replies with any solution or comment. So I did more investigating and this is what I found out.
It's an FM Direct Adapter NOT FM Transmitter, it needs 5v from the audio source to turn ON the box to eliminate FM signal, so it's used for Satellite Radios.
From Crutchfield: http://www.crutchfield.com/p_607FMDA...ml#details-tab
This FM Direct Adapter is not a stand-alone FM modulator and cannot connect to the headphone or audio output of other external audio sources; it must connect to the 2.5mm FM output on a compatible satellite radio receiver.
Detailed info on how it works: http://www.digitalradiocentral.com/s...lay-works.html
Now I'm on the search if it's possible to make this FM Direct into and FM Transmitter (with wiring changes). That way it's direct to FM station