Any Electronics Wizards In The Membership?

[SportsterDoc]

H-D pre 04 Turn Signal Modules utilize a combination of time and distance for auto-cancel.
The distance input is from the Vehicle Speed Sensor

http://xlforum.net/photopost/data/711/ch...ircuit.jpg

04 up use input from the serial data link on a 12 position TSM.

Pre 04 auto-cancel can be defeated by cutting the white/green wire.

Amazing how many H-D riders defeat it!