That explains a lot. Thanks. The switch is a simple on/off switch. 2 wires, 1 rd & 1 Blk going in one side of switch and the same going out. Like I said, I'm new to these electronic's and foam airplanes. My 1/2A p-51 has a switch that the batt pack plugs in to and then the switch plugs in to the reciever. If I had been able to get the Tiger Thunder ESC I probably wouldn't have had a problem. Thanks again.