I have a 98 fatboy. Under the seat between the battery and the fusebox is a part with a three wires coming out of it. One earth, one positive and a brown wire. It's got a crack in so it needs replacing but I'm not sure what it is yet. 

where does the brown wire go to?

First thought was some sort of load equaliser but it appears to go to earth not power, a wiring schematic would be right handy about now, tussuck will figure it out 😁

Although......going by these two earth is where it would go 🤷

never heard of a load equaliser...(sounds like a sex aid thingy)

Sure, Lastanpassung fur blinkrelais, just like the custom chrome label says.

Although the real question here is do you have LED indicators Beehappier?

Yes it's got led indicators but the resistor is in the wiring somewhere else. The brown wire goes into the wiring loom. My left indicator is playing up and I'm hoping the mystery part makes the indicators flash. 

Only just noticed Ruck, happy with the Antigravity battery?

Yes I'm happy with the battery.  I needed the extra cca. I bought a battery charger for it too. 

Ok. I sent an email with a pic of the part to harley heaven. I should be certain what it is and be able to replace it soon. Thanks. Rick. 

It looks like it was a load equaliser for the led indicators or low watts conversion. Somebody must have installed it for the old low watt indicators on the number plate frame that was on it when I got it.