New radio ground wire question

[Bigmd]

Ok, installing new radio. I have the factory Toyota harness that came with radio and the adapter Harness . I have everything wired up except the black ground wire. Does it get connected to the black wire of adapter harness or screwed into metal somewhere?

 

[riceandpho]

connect the black wire together, its a good ground.

 

[Bigmd]

Thanks , I should have updated this . I figured out the other day.