ground from battery

[Fenvy]

those thick 8 or 6 gauge wires that connects to the negative post of the battery...

one of them is disconnected, i think I may have forgotten to put it on when i replaced my intake manifold... where is it suppose to connect? or rather, what are the list of things that's grounded directly to the battery?

[TheOne]

it connects to the intake manifold, on the first runner of the lower half of it, there should be a hole for a bolt where you put it.