I haven't run my Unimatic in about a year because I didn't have a timer. I finally found one but it only provides wash action for (1) 30 second interval. To get around this problem, I spliced a wire going to the timer motor and installed a light switch. After the machine was rigged but still in storage, I gave it a quick test run ungrounded ( looking back at this, it is probably one of the dumbest thing I could have ever done) and it worked perfectly. I was so excited and I couldn't wait to get the machine hooked up. After I did, I ran a wire from the water vavle assembly to a cold water pipe. When I plugged the machine in, it spat a whole buch of sparks and melted the ground wire right off. Any ideas on what could be the problem?? The light switch is comepletly naked, maybe I should wrap it in electrical tape, but I don't see where it is shorting. Has this ever happend to other Unimatic owners?