Electrical connector size for rear lights ?

[ExTex]

I am in the process of wiring up a brake light blinker box, bought from Amazon.
I have a lot of 3.9mm (maybe 4.0mm) bullet electrical connectors, but the bike (1988 NT650) seems to have 3.4mm diameter connectors for the brake light, taillight and turn signals.
I want to use the same connectors so that I can remove the "black box" if it should fail
So I am in the process of ordering the 3.4mm connectors.
I was just surprised that they made both sizes. I am sure that my 1983 CB650sc used the larger size. Life is wonderful.

Stay Safe.

[The Cheese]

I don't know the size used. Sorry. I could measure. But it looks like you have it figured out.

What is this brake light blinker box?

[ExTex]

It is a brake light flash unit. A cheap one from Amazon that got good reviews. Only 4 wires; 2 in and 2 out.
Waiting for the correct connectors to wire it up.

https://www.amazon.com/dp/B01F4OKWSG...roduct_details

[Tusk]

I've used this site for plug and play into the Hawk harness in the past. I don't like cutting or splicing into a harness. http://cycleterminal.com/