I am having the same problem with the varsistor. He said they had a bad batch.

Rottendog is going to call me tomorrow on what to do and I will let you know.

Give Jim a call or email and tell him when and where you bought it.
I am having the same probs and he is going to send me a new board out.
http://rottendog.us/contact%20us.html

I think the blue varsistor is the problem.
When I fired it up the varsistor immediately started to spark and the bridge went bad.

Rottendog sent me the correct varsistor and now it works great!
No more fireworks in the backbox when it is turned on.