I understand how to jumper the hand torch to bypass the safety switch. I also know which pins to short to fire the torch I do not understand how to wire the 540 output to short the pins to fire the torch. Can some one offer a simple diagram as how to wire this. Also if a relay is needed can you suggest a specific one? I have a KL 4813 48v 13a unregulated supply and a 12v 16a power supply.The Powermax 45 with hand torch.