Thanks! I wish I had this years ago. I hope the mods will make this a sticky, because there are so many arguments how to get both hum and electrostatic noise out of a bass, much less an entire system.
As a side note, I did NOT like having to put 3-to-2 connectors to the couple of pieces of equipment I had to for that gig. And two or three other sources of ground loop hum I solved by plugging in the pieces of equipment (like powered stage monitors) into the same circuit without overloading the amperage rating of the circuit breaker. But the hum was just unbearable otherwise, and time crunch to the gig (The owner had reassured us he had just installed a new PA system that would be plug-and-go - yeah, right!). Since I did have to lift a green, and having been shocked myself from improperly or backwards wired mains in years past, I took my multimeter and double checked the screen of the microphones to the guitar players' strings to make sure there was no current leakage or polarity issue, and I keep and use an LED polarity checker in my gig tool box, what I call my $5 life insurance policy. No, it is not perfect, but as you know better than me it can at least reveal major wiring faults. Finally, thanks for pointing out the issues with making sure the white neutral is properly routed and connected as well as the black "hot" wire. My ex-father-in-law was a retired line foreman supervisor for a utility company, and when somebody had issues, one of the first things he would do is check the supply to the circuit breaker box and make sure all the white wires were connected properly to the bus, as they tend to be lumped together, which, as you also know better than I do, can compromise the circuit breaker box connections and wreak all sorts of havoc. Thanks again.
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