Hi,I gotta bad wire from kitchen recp to dining room.looking to trace route w/o getting into the walls {concrete].It's old wiring brown stuff maybe 12g no grd. looking for ideas.loc

[left]Hi folks, any thoughts would be awesome here. All I did was replace two outlets, I swear! :-) Our dining room has two outlets that were painted over and quite old. The outlet boxes are metal, FYI. I figured it would be a good idea to replace the outlets. The first outlet had two blacks, two whites, and then the ground wire went around the green screw, and then clipped to the box. For this outlet, I installed the new outlet in the same manner, except I got rid of the clip and put the wires in a wire nut and put it under a screw to the metal box. The second outlet simply had one black and one white wire, then the ground wire went around the green screw, then to the clip on the box. I installed the new outlet in the same manner, except I got rid of the clip and now the ground wire simply goes around the green screw then to the metal box with another green screw. When I turned the breaker back on, there was a quick spark on that breaker, and it went back to the off position immediately. I tried turning it back on again, and it just went back to the off position, no spark. I went back to the dining room and simply unscrewed both outlets from the box. I did not disconnect the wiring. Went back to the breaker and turned it back on and it stayed on. I’m assuming I have a short or mis-wire somewhere. I double checked the wires and they seem OK to me. I always seem to have a concern though about when you push the outlet back into the box, what if the ground wire touches one of the other screws. Could that cause this problem? thanks![/left]