Hey guys.  Picked up a Fatboy headlight from JP Cycles.  Seems to have a couple extra wires I'm confused by:

1.  There are two black wires:  one thinner than the other

2.  An extra yellow wire, separate from the main group, with some kind of connector at the end.

Any idea what these are for?  And which one would be ground...the thicker black line or the thin one?

 

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why not just pull the light apart and see where the wires go

White is hi beam, yellow is main beam, yes black is earth, the extras could be to loop it to another light, eg twin lights like road glide or fat bob. A quick guess without seeing it