What is it?

Hi everyone, have a question, Does anyone know what this is.
The small red circle with 2 slots in it just beside the
relay. It has a red wir from 1 slot going to the positive
side of the relay, and a black wire leading to the front
of the bike with a round eyelet on the end. the black wire
runs to the front of the bike but does not attach to
anything. It almost looks like someone added it on because
it runs outside the wiring loom
Thanks for your assistance