LH side lights only work when engine not running

RickP

New Member
The LH side lights on my 2011 T5.1go out when I start the engine. All the side lights work fine if I turn them on without the key in or ignition on. They also all work fine when the ignition is turned on. However when I start the engine the LH front and rear side lights go out. Also the grey/black supply to the LH rear light goes dead when engine is running but is live when the engine is off.
Anybody got any idea what stops the supply to the grey/black wire when the the engine starts.
Any help appreciated
 
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