ive seen cheap ones get the terminal spread too far and not spring back. If youve been poking round probe leads in it will accellerate the process. If you have power at the wires and not at the plug then likely it is overspread and needs replaced. It is hard to find decent recepticles anymore. I put 20A ones in my house because they grip tighter on the plug blades

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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)