There is a big difference between running heated clothing as per a motorbike and heated seats as per luxury tin boxes. Current for the former is reasonable, and the latter is not. Heated seats take a huge amount of current, and it does not surprise me one bit the alternator as fitted to the five speeder is not able to keep pace.
Not at all surprised Morgan don't fit a big enough alternator for heated seats. Indeed, I'd not be surprised if there wasn't a bigger capacity alternator that would fit that engine.
After all, don't forget, after 19 Jan, it's a bike...
