See the Electrical Crack: Why the Smallest Flaw Can Spark the Biggest Disaster
We couldn't measure that crack with a meter. We had to it. see electrical crack
When the house settled at night, the stud wall would flex, the crack would open by a millimeter, and the circuit would break. When the sun warmed the house, the plastic expanded, the crack closed, and the light worked. See the Electrical Crack: Why the Smallest Flaw