HELP new 4.7 v8 install

99 grand cherokee 4.7. the old engine was toast so i am installing a new one, but i have a problem. on the front passenger side their is a wire i removed(well lots of them) but only one that i don't remember where it went. it looks like it might be the ground wire off the negative side of the battery. i already connected the 2 ground wires on that side of the block. it is a thick wire with an eyeloop end, but does it go to the block, or the frame? anyone know?