OK, thanks to JayW's "how to" photos, here are the readings -- 119 at the outlet. 119 with the heavy extension cord plugged in (more on that in a moment). 119 with the hockey puck plugged in. 119 with the 30 amp cord plugged in. And yes, I wore heavy neoprene gloves while testing the voltage, which is probably overkill.
But here is the kicker -- the heavy extension cord has a faint notation on the exterior sheath -- "12 AWG." This sounds like a 12 gauge cord, not a 10 gauge. So I may just treat myself to a heavier cord and a new dogbone, if I can find one with the right specs. (I am not competent to roll my own.)
If these voltage measurements are all the same, does that mean that the problem is not voltage drop but something else? Maybe too much resistance due to the inadequate gauge? Or does too much resistance manifest itself as voltage drop?
And if I get a thicker cable, is that an Ohm Improvement? (Sorry -- I couldn't resist.)
