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There is no rear speaker wiring provided on the non-Ultra fairing model bikes. You'll need to use a 35 wire connector to access the pinouts on the HK radio for rear speakers. Here's a diagram of the Ultra system and from it you can locate the pinouts for rear speakers; the same information is provided in the HD Service Manual for your bike:
The 35 wire connector and the sockets attached to the wires prior to insertion into the connetor are shown in this diagram w/ part nos. for the 69200033 harness HD sells for installing the Ipod and Naviagation Interface Modules on non-Ultra Harman Kardon equipped bikes:
Bascially, you create the harness using the 35 wire connector to access the pinouts of the HK radio for rear speakers. If you want to be able to adjust the volume front/rear, you'll need the "fader" control turned "on" by the local HD store's Digital Technician. I've heard of some bikes being delivered with the fader already turned on; just scroll through the audio switch selections (bass, treble, volume, etc.). If you don't see "fader" you'll need the dealer to turn it on for you.
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