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Bad cable causing a short
"I've tried both the current and a new cable for the FD."
which would be very unlucky if both cables were bad but seems to imply it's the FD. I'd plug it all in and update it at this point and try again. I'd also try it with a different junction box - if you're saying one port on it is bad, how do you know the whole thing isn't flakey?
@M4xime it's not using an XTR RD or something is it? IIRC you can only run XTR Di2 with 1x. What type of RD and FD is it?
hippy
M4xime
Bad cable causing a short