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If you need parts for it who can you get them off in the UK?
Big assumptions here but.. I would imagine there is a cable going into a dedicated socket in your drive unit for the front light. If there is nothing wrong with the cable externally, you may have to pop the plastic cover off and find where it plugs in. Unplug, check the condition of the connection pins or whatever and use a replacement cable - which you will prob have to get off the supplier for these motors.
Then reconnect your light to this fresh cable.
That’s pretty much all I think you can do. If that doesn’t work then you’d be contacting the manufacturer, and seeing what they advise.
Sorry if you’ve done this already.
what is the motor on your douze?