Hi guys i have a clarke 135te turbo i bought this at a auction , it looks like brand new and looks to never of even had wire through it or even did a weld , however there is a issue with it that when i switch it on the fan starts and runs fine however as soon as i pull the trigger the 13amp fuse in the plug blows , this is just pressing the trigger not even trying to make a weld what could be causing this on such a new machine that looks to of never been used ??