Left Rear Indicator Triggers Both Sides To Flash, Any Ideas?

Hello, got a weird problem – had some old indicators on the back of my bike and I noticed that when indicating left, the rear right indicator was also flashing.
I had some new ones to fit anyway, so took the old ones off, checked all the wiring and used new connectors while installing the new ones, couldn't find any wiring problems. But it's still doing it.
I'm not sure how it could be doing it, but then I don't know much about the electronics. Hopefully someone might have an idea what to check? It's only the rear indicators – if I indicate left then the front indicator behaves fine. Also work fine as running lights and brakes. Seems like a weird one to me. Thanks for any advice.

Uploaded a video of it here: https://www.dropbox.com/s/trrpb8a5jocuth2/IMG_1581.mov?dl=0

 

Thanks, I'll have to trace it back and replace that earth cable.

 

did you get it fixed? My rear lights all flash fine after replacing the earth wire and connecting all up again.

 

Hello, just coming back to this problem I've got to see if you have any suggestions. I replaced the earth wire from the rear harness to the lights and made sure all connections were good. I thought it was working ok but now it's not again! I trickle charged the battery overnight because the bike hasn't been used for a while and noticed after that when I put on the left indicator it's triggering both of them again. The lights are all-in-ones and the right indicator, brake and running lights are working fine.

I've tried connecting a few different lights and they all do the same so it's defintely nothing to do with the lights themselves.


I tried connecting the lights directly to the rear light harness connector and it does the same so it's not a wire issue with the harness.

If I disconnect the running light then the issuer stops and both indicators work fine which makes no sense to me either! Any thoughts? @stollydriver @TEZ_217