Hi I was wondering if anyone knows where the wires go to on the aux switch on the forks one is for the lights and the other goes to nothing. I would like to use it for the radio. Thanks for Any help.

 

I am not positive but I believe you can get a harness for audio that just plugs into your existing aux left side front.

My right side was used for the fog lamps/light bar so I could switch it on and off as I Wanted, and I left the left side alone, that was on my 04.

I think if you look up Harley audio components for Road King you will get some parts and part numbers describing what you need to make it happen.
Lump

 

aux switch plug located beneath seat

 

+1 on controlling the the under seat connector. It's that was on my 2004 RK Standard.

 

Found it gonna go to dealer to get the adapter. Thanks for the help.