2008 ultra classic radio wiring diagram

check wire conections under seat if u had a back rest installed at some time they may have not got the conecter lock totaly and over time it may have came lose good luck

If you are mounting the unit to the bars or fairing, I would recommend using a power lead which is available in the fairing, rather than the AUX accessory switch.  The AUX switch sends power to a connector under the seat, in front of the battery.  You would need to run new wires up under the fuel tank, along the neck and into the fairing to connector your Zumo to the AUX.  Instead, there is a 12+ V switched ignition power lead which is not used on U.S. touring bikes and would be perfect for connecting your Zumo.  Pull the fairing off the bike (7 screws, TORX T-27) and look at the headlight harness, which is 3 wires, black, white, yellow.  Attached to this harness will be 2 wires, a black and an orange w/ white stripe.  The orange will have a red silicone cap over it to prevent it from shorting out in the fairing.  Cut the zip-ties which connect these 2 wires to the headlight harness and then hook it up to your Zumo, black is negative, Orange positive. 

hey first off harley has a harness that will plug in the accessory outlet under the seat, now to the speakers you didnt say if you had a stero or what, now you would run speaker wire from the source to the speakers you can get the male portion (i believe)of the plug at the hd shop or just go to radio shack and get plugs(male-female) there and just soilder them shrink tube the connection hope this helps

Pick yourself up a Garmin Zumo 550, it has a navigator, MP3 player, photo viewer, and XM (Radio, Traffic, & Weather) and best of all the music gets interupted when it's time to give you directions.