I believe the module you are referring to is for the OBD test plug. Not needed to run/charge.
I am unsure how you can have 14v everywhere but the battery?? As obviously the battery in in series with the entire harness. How did you wire up your accessory? if you wired in straight to the battery there is most of your problem. Lithium batteries hate any sort of parasitic loss like those accessories. Wire it up so it is on a switched 12v circuit and make sure it is only powered when the bike is running. Give the battery a good charge and test again. The charging system on most dirt bikes is really only good enough to maintain a good charge, it won't recharge a very dead battery.
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Back on a gassy! 2018 EC300! 🤘
Txt 280 07 to make me feel like a gumby again
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