what is this?

[jg928s4]

This round part is on my 79 parts bike hooked to a blue, blue red plug.  I have the plug on my 80 runner but no part, I guess I  don't need it but wondering what it is?

[Mike V]

Jg,

Turn signal beeper?  You may want to test it with a test light.

[Barry]

Yes I have the turn signal warning beeper. The turn signals will work fine without it. They are annoyingly loud - loud enough to frighten pedestrians which can be a good thing on some occasions. On balance I think they are a useful feature. I disconnected mine for a while then as they are a good safety feature I reconnected it again with some tape over the diaphragm to tone it down a bit.

The flasher relay wiring is very clever as with the turn signal in operation it turns the beeper off when neutral is engaged or the clutch lever is pulled in.

[jg928s4]

This one had tape over it, maybe I will give it a try.  Thanks.