I was told that my SESG cannot have the voice prompts come through the speakers. The only way the street glides can have that accomplished is to run that AUX cable and be in the AUX mode. Don't understand why the SG can't be set up to run through the speakers On that note, I tried my ear-piece that came with the 660 and it blows! I have the volume cranked and cannot hear it where its useful.
NOT true! The MoCo chose not to provide the capability natively on the SESG - but it's easy to do. I have it working on my SESG now using the H-D NIM. The 665 interrupts whatever is playing on the radio, iPod, etc, to give you the voice prompts.
The SESG does not have the 6A/B connectors in the fairing that the NIM normally plugs into, but you just splice into four wires to make a 6B connector - the CAN+, CAN-, Radio Memory, and ground. Works great. There is also a connector harness that the MoCo sells to pick up the CAN+ and CAN- wires from the big 35-pin connector 28 on the back go the H-K radio.
You can also make a simple alteration to your radio to implement a rear aux port, so you don't have to run the ugly wire out of the fairing and into the front Aux port on the radio for the Road Tech 660/665. Everything is inside the fairing this way.
There are threads in this forum discussing how to do this. "Legalley" has a good one for the SESG that tells you exactly what to do...