Originally Posted by jslimm
You can't check resistance when there is a voltage applied to the thing you are checking.(well, not totally correct; but, you have to know what you are doing)
There has to be no voltage applied so that no current is running through it. Typically you would want at least one of the endpoints disconnected so that you are not measuring the resistance of more things in the circuit than you intend to measure (and that also ensures that no current is flowing in the thing you are measuring.)
Ok. I will check resistance with wire cold and then when its hot. I will disconnect the wire prior to testing it.