Had a friend come over last night who helped me wire up the tail light and indicators - turns out I'd blown a bunch of fuses in my foiled attempt to do it myself. "Try - fail. Try again - fail harder. Try again with someone with a multimeter, soldering iron and electron-manipluatin'-know-how.....
...win"
In other developments however, turns out that the stripped cam chain tensioner bolt thread that I knew about but was quietly hoping would heal itself, hasn't. Hoping that my mate will come up with a fix that won't involve removing the engine from the frame to install a helicoil or time sert or whatever. Anyone got any suggestions?
To recap, the thread is totally stripped, meaning the bolt that keeps tension on the tensioner is literally just sitting in the hole in the head - no tension on the tensioner at all.