I'd eventually like to hook up a few electrical accessories to the V (driving lights, maybe some accessory lights, an outlet to hook up navigational equipment, etc.) and was taking a look under the seat when I found these guys:
I'm guessing the red arrow points to an "accessory power line" but I have no idea what the thing in the blue circle is! I'm wondering if I can potentially hook up an auxiliary fuse box and/or relay to the potential "accessory power line" (If that is, in fact, what it is)? And any thoughts on the doo-dad in the blue circle would be greatly appreciated!

I'm guessing the red arrow points to an "accessory power line" but I have no idea what the thing in the blue circle is! I'm wondering if I can potentially hook up an auxiliary fuse box and/or relay to the potential "accessory power line" (If that is, in fact, what it is)? And any thoughts on the doo-dad in the blue circle would be greatly appreciated!