....... They tell me there is no specific diagram as the bike was initially a 6v magneto unit with no standard upgrade to 12v......
That's kind of true, but the second diagram I posted shows both 6 and 12V systems so it should give a pretty clear idea of what's needed. It looks like it could be as simple as binning the rectifier, hooking the 2 power box leads to the 2 alternator leads and run the power box output lead to the #3 post on the switch. (Use the existing wire in the harness.) If it's a positive ground power box, the only other changes would be battery
and bulbs. (Horn too.) I really think you could use an original wiring harness with only minor revisions to how connections are done.
.....P.S.I was trying to attach a photo of my Constellation, as I mentioned I love the bike and wanted to show it off. Is it possible to copy and past a photo in the forum
It's actually pretty easy even with a slow internet connection but it is a multi step process.
Step by step:
1. Snap a photo with your phone.
2. Set up a free postimage account.
2a. Upload image to postimage. (I transfer it to my desktop then upload it.)
3. Copy their "Hot link for Forums" for the image you want.
4. Paste that link into your post.
5. Use the "Preview Reply" button to be sure it is what you want.
6. If it's all good, post the reply.