Customer had issues with a new switch tripping the breaker when it was flipped to the off position. The wires are old so I started unwiring each wire from the switch until it no longer tripped the breaker. After I found which wire was tripping the breaker I went through the house to see if anything was tied in with the wire, I could not find anything tied together with the wire so I capped it off and pushed in back into the switch box. Everything is working now