Solved... when the high beam +ve connector is removed from the bulb all is good. I think the left handlebar switch is just a single pole lights on/off and it was never designed for a high/low beam option. Hence when I connected the black lead to the bulb high beam the switch earthed out the tail lights..
I shall go the AC to DC route as described in the sticky.. Thanks all.
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Retired
EC 250 (2007)
UK
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