how do I find a broken under ground wire for my innotek pet containment system?

Answer 1

Before you dig, inspect the path the wire takes. Generally, there will some trauma to cause the wire to break. Vehicles, somebody digging, or other event MIGHT have left a mark. Other than that, it will take some sophisticated equipment to locate the break. It may be that laying a new line will be the preferred option.

Answer 2

dig up various points thru out the yard, ohm meter, volt meter whatever you call it, do some tests to see ya resistance, its gonna be a process of elimination