My EHU has a built in polarity tester. It`s a little red button which lights up if the polarity is reversed. Might be worth checking if your EHU does before you buy another piece of kit?
Also take a plug/socket wired together with the polarity intentionally reversed. Saves rewiring your main lead every time you come across a wrong one. There's a picture of mine in my image gallery.
------------- Steve
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I like the odd drink. Five is odd, seven is odd, nine is odd...........