2000 Volvo 770 where does this ground wire go?

Hey guys, I been trying to figure out where this ground wire goes on my dads 2000 Volvo 770. It has a Cummins N14 celect+
The wire is coming out from the harness where it plugs into the alternator. Any help would be appreciated.

 

Thanks for your response. I will look later today and find out if it has a number. I don't remember seeing one, but I will still double check. I hooked the ground wire on this one spot I found just to test it out and the battery light came on. When I disconnected the wire the battery light went away. So maybe it doesn't use it at all just how you mentioned it..

 

Yes the light comes on. So I don't need to ground this D+ wire?

 

Gotcha. Problem is the truck battery keeps dying over night. But the battery light doesn't come on after I use jumper cables to start it up. Alternator seems like it's running fine, but I might have to check it out with a dvm. The battery is reading 12 volts at the moment, but it just won't let the engine turn over.

edit: alternator is reading 12 volts as well.

 

Ill try that out thanks, Ill keep you posted soon. I'm actually working on my Mustang this weekend, but I should be heading back to where sits on Monday.