Left turn signal stays on but doesn't flash

Hi guys, so I recently bought a 1978 KZ400 Deluxe and I'm having a problem with the turn signal.

When I turn on the right one, everything is normal. But when I turn on the left one, it doesn't flash but just stays on. This is the same for the front and back. I figured since one side works, it's not the relay.

The previous owner said she was getting annoyed by the clicking sound of the turn signal so she unplugged something and it stopped. She doesn't remember where she unplugged it or what was unplugged. I looked all over for something unplugged and the only two things I found were a two-pin male connector that had a brown and orange wire going into it which I know have to do with the turn signal. There is also a female two-holed adapter (circular holes) that have just one brown wire coming out. They don't look like they would fit together. I'm just really confused as to what is going on. Any suggestions? Thanks!