Help locating battery junction box on a 78 300cd w123

[Cornhandler]

Hey, ive recently upgraded my sound system before upgrading my alternator (doh) and currently im doing the ALX129x alternator swap for some more juice, but i cannot find this damn box that i see everyone else finding. I've followed my alternator wire and it goes into the body on the left side of the battery. ive heard its in the front fender/wheel well but no dice! ive checked my chilton too, im looking for a ghost rn! any help would be greatly appreciated!

pic of what im talking about (on a 300d)

http://www.peachparts.com/shopforum/attachments/diesel-discussion/60008d1224044175-im-need-w123-wiring-diagram-please-starter_terminal_block_300d.jpg

My alternator wire

https://imgur.com/a/HICsy86

where it goes into the body

https://imgur.com/a/uI6aHWu

and a clean engine pic for u nerds

https://imgur.com/a/DlCs2Kf

love these damn things!!! Planning on doing this today, i got 12ft of 4 gauge and 8ft of 10 gauge and some ring connectors, any tips for doing this would be welcomed too!