I had my rectifier hanging by the wiring harness and it was touching the chain and when I started it up it arced off the chain,doesnt the rectifier ground to the frame through wiring not through the box itself? I would assume it did because it is mounted on a plastic airbox I'm still trying to figure out my no charging problem,I did the ground thing and their good,but the rectifier grounding out like that tells me its fried what do you think?

 

****** one up off of ebay and hopefully your problem is "rectified"!