Ok I'am a newbee. I bought a HA90 MP3/wma Player off e-bay
It did not come with instructions it has 1 radio jack & power wire
I have a 06 Ultra classic
is there a way to plug the player to the back of the radio instead of the front??? the HD Dealer is no Help.

 

No front is it, unless you want to use a transmitter, set it to an unused radio station an set yor harley radio to the same station and you should have sound just not as good as hooking up to Aux port. Hope this helps you some