When I get back to the boat I shall disconnect this fly lead and measure the voltage on it with engine running through start-up to full voltage, that might tell me which side of the rotor it is connected.
The red Adverc sense lead is extended right the way to the battery + terminal.
I have rung the new alternator supplier and am going to send them a photo of their connection in it and see if I can change it, alternatively take it back to them to do it.
Luckily, I have a spare standard alternator that I can fit meantime.
"Once the Adverc is working you can persuade it to boost the charging voltage by putting a couple of diodes is series in the sense lead". that sounds like a good idea, I'll get some ready to take.
"Trojans like about 14.8 volts so the Adverc should provide this during the high part of its cycle." that is what I now aspire to, in order to keep my 4 new babies thriving.