Okay...Im replacing the main electrical harness from the fuse box, there is a black box, about 2" x 2"with 4 connector blades on one side, 2 connector blades on another, and a gray wire from another side. I know where it goes and how it hooks back in, it connects right next to the fuse box...what I would like some help with is understanding what its for and what its called so I can order a new one.

Thanks in advance for any help...

Could it be the Anti-theft relay?
Ron