Disconnect the suspected circuits from one another at the air handler or furnace in a split system or from the main board on a package unit at the field connections, leaving the common wiring ...

A little short circuit can lead to big trouble. In 1996, a spark caused by faulty wiring insulation exploded fumes inside TWA Flight 800's fuel tank, leading to a horrific explosion and crash that ...

Let shows several diagrams, but he mentions that at one point he shows an incorrect schematic (at 12:03) instead of the early correct one (at 10:35) and mentions it, but if you are skimming the ...