I recently went to replace a couple 3 way switches and, I am ashamed to admit, did not do my due diligence when wiring up. The new switches were a different style and the wiring configuration was seemingly different, not to mention that this is a 50 year old house without much conduit or even a grounding system. Though there are quite a few gfci's.
I finished installation and as soon as I put the fuse back in, it blew. I put another in, and it was ok. Went and checked and nothing on the circuit worked.
I must have shorted from hot to neutral through the 3 way switch, though after thinking on it, why was there a neutral leg for that switch anyway?
Too late at that point. Now I am trying understand what I did. ..i get 120v from just downstream of the fuse to the neutral bar, but after it leaves the fuse box, I can't find a hint of hotness anywhere on the circuit. I'm worried I burned the line open, especially since it looks like the previous owner had a 20 amp fuse in with all 15 amp circuit components.
I feel pretty dumb for letting this happen. I have two years of electrical and have schooling though it was back in 2009, and I let my confidence get the best of me.
Tomorrow I might look through the basement drop tile ceiling for clues. Any suggestions on troubleshooting this would be greatly appreciated.