Im surprised I didnt think of that myself. Then again many dont have a meter or even know how to use one. The battery test is simple-sort of... BobWhy don't you just use a multimeter to see which of the two leads is connected to the tip of the jack? That would be your positive lead and the sleeve would of course be ground. Unplug the jack from the amp and test it. I know it's sort of a simple answer but it's the right one and I should have thought perhaps the obvious one...
From his question, I gathered he could not remember whether the white or black lead from the speaker connecting cable went to the positive or negative terminal on the speaker. He didn't say the speaker wasn't marked (which would be very unusual, can't remember seeing that before, unless it's some junk speaker that should be replaced anyway), but that he could not remember which way to hook up the wires.Because using a multimeter won't tell you which lead is positive on the speaker itself, only on the jack, which isn't the problem.