20-05-14, 09:48 PM
I can only imagine they are a lower wattage bulb than standard and drawing less current, subsequently causing the quicker flashing.. Will be an issue come MOT time if flashing more than the acceptable level.. Only seen it on the led type indicators which draw even less current.. Upgrade the bulbs (if poss) or fit resistors..
Better to have it and not need it, than to need it and not have it..