Coincidentally, I have just fitted a bluetooth receiver to my bike radio so I can listen to plays from my iPod, works a treat, it cost less than a tenner (
http://www.ebay.co.uk/itm/2614335454...%3AMEBIDX%3AIT) and no earth loops. This one doesn't have a 'pair' button so no need to press anything when turning on. I did remove the battery so when I turn on the radio it starts to connect at once. Seamless!