W140 main power lead wiring diagram

[JHZR2]

I don’t have 12v at all fuses. I pulled the fuse box and see the wires screwed well to terminals each designated with a letter. I don’t know how the busbar in the fuse box are lined up and connected by row. Some rows didn’t even have a main connector.

Can anyone point to a wiring diagram for the fuse box, and where the conductors, especially the one that goes to “T” comes from? Hoping someone knows the connector name/number and location.

Thanks!