-
EW79A implies it's the original 10 speed Dura Ace with big multicore connectors and hardwired cables that's completely incompatible with everything newer. Are you sure?
Unplug one thing at a time until the problem goes away. Replace that thing. Or unplug everything, see if the problem still occurs, then re-add things until it reappears.
-
Limit screws not touching are they? They'll drain the battery quick if they are.
Battery might be on its last legs, if a cell dies then it'll discharge quick too -
You might want to check that all cables are in good nick. In my case the stem junction box => bottom bracket junction box had developed an intermittent fault (presumably due to bar bag rubbing & kinking it) and it wasn’t enough to kill the system altogether at first, but enough to make it appear as it was draining super fast (to this day I’m unsure whether it was that, or the charger not getting through, but I replaced that one cable and the problem went away)
You are reading a single comment by @onyerbike and its replies.
Click here to read the full conversation.
grams
TooTallTim
cgg
@onyerbike
Got an older external Di2 setup which now seems to discharge completely after a few hours. Any ideas why and moreover, how to diagnose? Shop with some connection wizardry, adding my wireless unit didn't work and the junction is EW79A so can't connect it to my own laptop?