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a voltage drop test is done point to point along a complete circuit. The idea is to not see more than .2 volts on non-electronic circuits. You are measuring the loss of voltage along a path which indicates a poor connection. Much more accurate the an ohmmeter test and usually much easier and quicker to do

check out this video for good example of how to do a voltage drop test

http://www.youtube.com/watch?v=v0THDAS1nws

for a more in depth understanding here is another great resource

http://vestest.com/testingtroubleshooting.htm


Let me know if anyone finds this useful