System
The Tenere rectifier / charging control units (what is the correct name in English) have a feature that makes it check whether it sees a good attery. Voltage over the terminals must be above, let's say 11.5 V. If it is not, the system will not charge.
My advice: just buy a new battery, then you have at least eliminated one possible cause. Install it, measure voltage. Should be 12 - 12.5 V. Start engine, measured voltage should go to about 13.5 V. If not, your charging system has a problem.
Auke
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