Contribution d'origine par : BeenThere DoneThat ,
'''Quit using yourself to detect potentially deadly voltages.''' Use a voltmeter. Quit touching two things to see if you get shocked. Check AC and DC voltages between the case and the ground terminal of a known good outlet. You might be surprised what you see. Outlet testers tell you the polarity is correct, and that the ground and neutral are at the same potential.