2016 Bonneville Turn /flashers

I'm not too sure what's happening here, when you say flashers do you mean like hazards, where all indicators (turn signals) flash at the same time?
If so that might be a US thing, here in the UK I've never had a bike that had this function.

 

I would imagine it has a separate flasher for each side regards hazard warning lights but cant confirm this, you need to try and find a wiring diagram for your particular model to confirm.

 

Old school, there are no traditional flasher relays, its all done by the ECU. Have you tried the “I” button to change the flash mode?

 

Your header said 2016 Bonny right. Still confused , are you saying your turn signals only work on one side or are you talking about your emergency flashers?

 

I believe its his emergency flashers !! (hazard warning lights) that are only flashing on one side .

 

Ok if the OP ever comes back and he has a newer Triumph- 2016 or newer, on the left side controls there is a button marked ‘I’. That will toggle thru, mpg,clock,and so on. If you want to change the flashing rate of signals and hazard ,say if you change to leds,this is where you do it. Here is a tutorial on how. Hope it helps. I switched to leds and it works perfectly

 

Ok last try. Get some CRC electrical contact cleaner and lube. Spray with straw around/in the 4 way flasher button. Thats all,I’ve got.

 

You should have a grey "i" button on LH handle bar. Ignition off, hold "i" button down, ignition on and wait until you see "type", release it should say " type 3" for LED flashers. On my Bobber, if I press again it shows Fault Codes (P0000 = no faults).