I know exactly what wire that is you're talking about as i did the same thign yesterday.
There are;
1: Large starter main power
2; activation or trigger for the starter (slides onto the starter)
3; big fat ground wire
Those obviously go to the starter,
and since i could not find a place for that bigh tick black wire to go i just grouned it to the intake manifold bracket that goes inbetween the mani and the engine mount.
I belive it's the ground for the engine.
But make sure you hook up the groundstrap on the tranny and the one at the back of the head on the drivers side, firewall to bracket.
of course make sure you crank to motor with the "EFI" fuse pulled out until the oil pressure needle rises ever so slightly.
After i did that i was just cranking and not starting, so i checked codes and i was getting code 11 because i disconnected the plugs from the ecu to pull the motor, so just pull the "main" fuse under the hood and wait a minute then replace the fuse and try again.
hope that helps