MS, I had a similar "issue" with a good friend when he first purchased his Duo Charge a few years ago. And we also ran into this when folks purchased their Link Pros and Link Lites. In those cases, I recommended that they download and review the Link 2000 manual, which provided a ton more information as to how they really work for both the wiring and the old Gotcha algorithm. I believe Xantrex, in their infinite stupid reasoning, has now removed the older manuals from their website, which makes helping people that much harder. I have no idea why these corporate trogs remove valuable stuff from their websites - it's not like it's killing their damned bandwidth. If only they'd look at customer feedback positively instead of ignoring it.
Stu Jackson, C34, 1986, M25 engine, Rocna 10 (22#)