I agree with Robert.. The advantage of a voltage drop test is it shows you what the circut resistance is really doing to the available power.. Using a Ohm test passes such a minmal amount of current that a low ohm reading will make you think all is good when in reality that circut might not be able to pass the required amount of current due to high resistance & the voltage drop on an active circut would show that accurately by not passing full voltage through the component your testing...