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When Im tracing a short I simply find the circuit in question and disconnect both ends of the wire from the receptacles in question ,,separate the wires on the end of the wire and using a DVOM I touch the red wire on the dvom to the black wire in question and touch the black wire on the dvom to the whit wire in question and then to the bare wire if no continuity then move on to the other wires in the circuit. When the dvom shows continuity then you have the culprit. If searching for a short to the chassis attach the grnd or black wire from dvom to the chassie and touch the red wire from the dvom to the black wire on the suspect wire and if you have continuity then the short is to the chassis .