Is there some sort of device that will let me follow the wiring path without ripping my walls and ceiling apart? I have a circuit that runs from the electric box into my garage to feed the garage door openers and then out to a detached garage. Some of the things on the circuit still work like the garage door openers in the main garage, but some do not like the a couple of the wall outlet in the main garage and nothing in the detached garage. Most of the outlets seem to terminate at the outlet but one or two (dead) continue on to other outlets, maybe feeding the other dead outlets.
All the working outlets that I have opened so far that I assumed would be most likely to be feeding some of the dead outlets terminate at the outlet and do not continue so these can't be the problem. All the outlets that are dead that continue on to other circuits do not see to have any juice coming in either even when I test the wires directly so it appears these outlets are not the problem either. There must be some junction box or something that I can't seem to find that has the short.