Does anyone know where the plug is located that you plug a siren into through the stock security system a Fatboy?

 

If you pull the mud guard off from in front of the rear wheel (2 bolts), you will see the turn signal module and a cable right above that plugged in to the plastic bracket.

That is the connector you are looking for. The siren module snaps in below the TSM and that wire plugs right in.

 

Thanks Gwalsh!