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Guys, I'm a new Harley owner and I'm trying to learn about my bike. I figured out the accessory plug and the B+ plug under the seat, but what is this plug? (See attached photos). It's on the right side, near the oil fill dipstick. It runs directly to the battery, fused with an inline 7.5 amp fuse near the battery. Is it factory or an add on for a battery charger or other accessory??? 2006 FLHXI.