If you have the factory installed security system on your Tri-Glide and are thinking of adding the optional siren part number 68328-06, read this first.
I bought the Siren online and when I installed it, it would go off every time I turned the ignition switch on. This is what is causing this problem.
Harley issued TT408 on June 18, 2009. this is the text of that bulletin.
Due to the fact that the Tri-Glide and sidecar models utilize a remote bank angle sensor in addition to the HFSM, The siren functions slightly different than other models.
if a siren is installed on Tri-Glide or Sidecar equipped vehicles, the siren may sound when the ignition switch is turned on, even if the security system is disarmed. This will only happen if the transmission is in neutral or the clutch is pulled in.
To prevent the siren from sounding at key-on, be sure that the transmission is in gear when you turn the ignition switch to "ignition". You can then shift the transmission to neutral for start up and the siren will remain silent.
I just thought I would post this to prevent someone else from going through what I did. I would have to break a 45 year habit of always having the bike in Neutral and having the clutch pulled in when I start my bike. Too much for this old codger.