I was in the base adding a light in one of the rooms, and tapped into a romex wire at was near by. When I turned the breaker back on it tripped. I checked my wiring and everything was right, so I disconnected the romex wire. When I reconnected it the way it was and rechecked it I found out it was wired to my kitchens 3-way light switch. After this I called it a night, and went to bed with everything working. When I woke up the light in the 2nd floor bathroom, and two bedrooms is not working. When I put the meter on the wall plug I get voltage on the black wire, and on the white wire in the three rooms. But the breaker is not tripping, and everything is back the way it was when I started. Please give me an idea where else to look.