Has anyone installed a horn kit on their uforce 1000xl. Purchased a kemimoto plug and play horn kit and cannot figure out where to connect it to any ports in the machine. Any suggestions?

you can ground the black wire anywhere.
from my own goofs I would suggest wiring in a secondary fuse block and tap the hot wire off of that.
the two open spades are for the horn and you'll have to find a power source and ground for the chassis side of the plug.