arc between crankshaft pulley and engine block
 

Hi guys!, has anyone encountered this weird problem?, I have a 2002 accent gsi with 70.000 kms, and every time the throttle is above 1500 rpm there is a constant arc between the crankshaft pulley and the engine block. I am baffled as to what it could be, as I have already cleaned all the ground wires, and the arc is still there. any comments on the situation would be greatly appreciated