Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
Black red on rh switch is for yanks with no lights on off, it feeds the fusebox main fuse then headlamp and disconnects headlamp when starter button pushed.Rear light should have BrownGreen/yellowGreenBlack usually has a coloured ring and is indicator
To fully understand what you have you need to look at both US and UK diagrams to see differences.You MUST insulate well that loose black/red as it will have positive 12v on all the time ignition is on and start button released
I found my original loom had colour faded quite badly plus I had a none UK left side handlebar switch unit though it looked original in terms of age. Just no pass switch & different horn wiring.I made up a mini loom for the rear lamp unit to retain the original colours as mine was in very poor condition. If you PM me your e-mail address I can send you my XL wiring spreadsheet if that helps.