Just plug the battery in any of the other cables of the parts you can actually see on etube. Found it now? Then it's the cable.
Or it could be something with the firmware. Actualize everything, even if you have to do the battery individually
The problem is diagnosing this without etube.
Bike is at home, etube is at work. Mac household. CBA virtual machine just for this. Going to dig out a spare junction from the workshop and try to swap that in. If that doesn't work I'll just have to suck it up and ride the bike in single speed
I checked the connections and swapped the FD cable for the battery one. No dice