I have already found the problem, it was that plug was black and when I tried to
have a good plug reading, it coming similar than grey.
What I did is to start with a new plug and now plug reading is ok.
Thanks a lot Jakobi for for help.
After triying many posibilities the one I prefer is 48 178 NOZG 3? and screw 2,5.
i am going to add it in database.
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