Paul,
Have you used the lights before or is this a new fault? If you've used them before then its unlikely to be the earthing at the lights and more likely to be something in the electronics box on the handlebars. Either way it must be a bit annoying to find it at the end of the journey.
Nick
Have you used the lights before or is this a new fault? If you've used them before then its unlikely to be the earthing at the lights and more likely to be something in the electronics box on the handlebars. Either way it must be a bit annoying to find it at the end of the journey.
Nick