I have an 07 SG, out of the blue my left turn signal will start blinking, it won't cancel by switch only by hitting the right signal. 20 seconds later it starts blinking on it's own?????

 

Sounds like you have an electrical fault, perhaps a damaged wire. Are there any mods, such as new handlebars, internal wiring?

 

no mods, just started last night, spoke to our local service guy and he thinks its something at the switch on the bars, thanks for the reply and i will post my findings!

 

After a few days of chasing wires I finally found the problem, a very slightly worn white wire from the headlight plug was arcing on the metal bracket. 500 miles yesterday no issues.

 

Glad that you found the culprit. Electrical gremlins can be tricky to catch.