When I worked in automotive engineering we used a lot of Chinese made parts and as long as you keep on top of the QC they're fine. Give them an occasional non conformance note so they know its being checked and the quality is spot on but let it start to slip a bit and you get problems. I guess BMW and Harley didn't keep on top of their QC checks.
Let's be honest, faulty wiring is part of the Triumph character. It brings back memories of British made Lucas wiring.
There was a bloke on TV a while back with a Lancia and when asked whether everything worked he said If everything worked then it would be an Audi and I don't want an Audi.