If you're only doing your end, you're relying on whoever installed the system having terminated the wires at the main unit in a predictable way. Make a note of how yours are terminated currently and see if that it easily translated to whatever replacement you get.
If you're only doing your end, you're relying on whoever installed the system having terminated the wires at the main unit in a predictable way. Make a note of how yours are terminated currently and see if that it easily translated to whatever replacement you get.