You can just bypass the control box, and wire the grips straight to the terminals, the Oxford grips are very simple unlike the Hondas. That'll tell you for sure, but the odds of them both breaking down at the same time are very slim, so it'll be the box, I bet you a pound.
I discarded the box entirely (that's how Thor got it!) and replaced it with a simple switch and light from Halfords, home of top quality motoring accessories
![Smile](images/smilies/icon_smile.gif)
But I think some people find that too unsubtle. I always had mine full on, or off, so the lack of control's irrelevant.