FLSTC 2000 - black box under seat?

[Jacka]

I have black box under seat (box size is like normal tobacco package). Box have two connectors. Another is three pins connector and another is like tv-antenna connector... What is that box?

Are these (optional) box wires ready when -00 heritage comes from factory?
And anyone have a link, where is -00 Heratage electric diagram?

Thanks...

 

[dbmg]

Is there any type markings on box????
Or how about pictures.

 

[Jacka]

There is no any marking on the box, but here are two pictures...
Who konown what is that box and how it works?

 

[SixPak]

The round connector looks like a cb antenna connector. So I would say it's for either a radio or cb.

 

[STEVE07]

HD hidden power antennae. I had one on my bike. They are junk IMO.