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There's only one black lead on that picture. The earth lead is common between the two sets of contacts, so I just soldered two wires onto that single wire.
Yep, the main reason for using Di2 cables was that I couldn't find really small twin-pole circular connectors, so just used junction Bs and Di2 cables instead, and because I wanted to be able to disconnect the switches from the R600 internals.
I don't use a 3 or 5 port Junction A box. I'm running an old-style external battery (the P5 has a special cubby hole for an external battery mounted interally) so I'm using an SM-EW67 Junction A box. It's smaller so it's more aero...
Brommers
Thanks for taking the time to share. This is just the info I needed for my plans. Only thing I couldn't see was 2 black leads (earth?) in the picture above.
What was the requirement for wiring using Di2 cables after the climbing shifter? Just for ease of splitting using the junction b?
I had thought I could wire two sensors for the up and two for the down directly to each side of the climbing switch in parallel. Essentially a DIY blip and clic for the base bar and extension running into the switch.
Last question, is the 3 or 5 port then redundant connecting into the Junction B in the frame?