I recently got a link for Amazon with a link for a 6volt regulator. I can't find it for the life of me. Perhaps you sent it?

Wasn't me but if you can bring this listing number up on ebay this is the sort of thing you need. Just earths through the body but needs an earth wire if mounted on plastic somewhere on the bike.
eBay item number:232687768306
Here's link to the pic i copied.
photos.app.goo.gl/qfeEMNP473tVdccU7
Not sure why it says australia but should have them in the ebay usa for sure. That's the type later trail bikes used with finned aluminium for extra cooling. See what others think.

It looks like you already have a regulator on the bike?

I think RT325 had a good idea earlier, not sure which thread at this point. Direct connect to the turn signals and test them individually. Seems odd one side works and the other has a problem considering its the same power supply to the flasher and is just switched on the handle bar.

Somehow i didn't add the regulator pic link in post #2. It's there now.!!

I do have a regulator and was able to hook it up today. One more thing off the list.