Not an HRC harness
The black box is the delimiter that most people use instead of the wire splice.

The HRC harness is missing a bunch of stuff. Pretty basic just for race use.
I'm in NC and I have a 93 MC21 SP

We are fitting RS250 bodywork to the bike since I never got my fairings from the seller.

Good luck I have had a bunch luck getting info on this fourm!!!
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1993 MC21 SP