hi i have now sorted the wiring out. i have one problem with the working of it. when switched on the fan operates but nothing else, it looks as though there is burning in the pcb on the mains side, so i carefully removed the pcb cover and pushed down the contact on the 12 volt side this started the 12 volt wire motor when i pulled the trigger to try welding it worked and stopped when trigger was released. but the wire motor would not stop, does this show the fault is on the pcb, many thanks