I am working on an array of El wire inverters for a display. Seven of them to be exact. I seem to be having problems with supplying adequate power to each card. They are connected in parallel and the power supply is rated at 6 volts up to 10 amps. Each inverter pulls about 350 ma. What happens is that invariably one of the lights will not work. A) what do you think might be wrong? B) how do I fix it?