After 21 years of uninterrupted service, power from dual receptacle stopped working (#1 last one on line). Following advice already in Sparky forum, I checked nearest upstream outlet (#2) and found same problem. Next upstream outlet is a ceramic pull chain ceiling light fixture (#3) which does work. Electrical test lite glowed in receptacle #2 & #1 but do not know if 110 or less. I removed receptacle #1 where problem started. Checked wiring which seemed okay. Replaced it in box and it worked. Checked #2 receptacle and that worked. Having dropped the ceiling unit I decided to replace the chain socket with a new one with a longer chain. Everything was functioning so I replaced all covers. Went to turn on a lamp in receptacle #1 and I found myself back to square one. Test lite showed some power in #1 & #2 receptacles but do not work. What causes receptacle to just quit. How do I correct this weird problem???

I am working on the wiring in my new garage. I have a circuit that contains (from start to end) a GFI outlet then 3 other outlets. They all worked fine. As an after thought I decided to add 2 lights in the attic. I spliced them in at the last outlet in the circuit. Now the lights and the 3 nonGFI outlets do not work. Any suggestions as to what went wrong? Thanks.