hi, could do with some help, Have a 2kg SDS+ hammer drill whats has been used alot from drilling wood, concrete, mixing....anyway this last few times of using it, after switching it on it works then when i stop is seem to blow fuse, i think. can only tell cause when i swap fuse it works again.. been doing this for about 4 times. anyway does anyone know what is causing this? any help would be welcome thanks.