Sorry, back to my original post, changing a door contact....from what I have read, it’s a simple matter of the switch wire being connected to the two silver screws.....and the tamper wire joined together and secured up in one of the brass screws..
 
	 
 
	i was k with that..
 
	 
 
	however, I have resistors in mine, one between one wire  ( connected to a brass screw )and the silver screw....plus another resistor linking the two silver screws.....there are two,other wires, I assume the tamper wires, but these are not joined, they were just tucked away in the back of the switch....
 
	 
 
	i believe  I can  replace the switch, using the existing resistors , not sure if the tamper wires should be twisted together and secured in a spare brass screw..
 
	 
 
	many thanks
 
	 red is One switch wire the 2nd switch wire; green, connected with a resistor to the blue terminal. Yellow the resistor between the two switch wires.