Good news!
The "new to me" BMS sensor cured it all. It's a shame I didn't try that before replacing the pain-to-get-at support battery.
Used sensor was £25 off Ebay, and a 5 minute fit.
Ran another BMS reset, cleared the archive codes. wipers now work, stop start reports to be online.
Happy Mrs.
Edit: it's also worth noting that even with a dead BMS sensor, the main battery does seem to charge and maintain charge via alternator regulation .. good to know.
Last edited by Vogalogue; Jan 13th, 2022 at 13:47.
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