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yes very good link. I wanted to share.
I have ran into this many times and first on 2prong electrical cords the neutral is the ground as in most electrical panels the ground and neutrals are on the same block. now the most blatant issue like getting a reading close to 100V look up at the power line to the house (if aerial of course.) you will more than likely see that the neutral is broken (bare steel braided line also used for the powers drop support).
As for the ground the easiest way to test it is take the VOM set it to ohms/continuity touch one lead to the ground block and the other to the power meter box or the power ground that the cable is grounded to!!!!!! You should get a solid tone and (0) readout, if not then your ground is not really a ground and it is grounding at the strand or the tap. I always unhook the drop after this first test then check with a voltage probe this eliminates the ground from the drop to the strand tap.
Next perform the same steps as before, if you get beeping sounds then you have voltage on the ground that is not sufficiently grounded or a poor ground potential. This can mean a couple things, the ground wire from the meter isn't grounding or attached to the ground rod properly, if there is not wire-to-rod and the cable is grounded to the snorkel then look at the neutral on the power line (never touch it and always use your voltage probe before doing any of these tests). it may be broken but it could also be a loose neutral connection on the power Co. side and the excess voltage that is not being used is coming through the cable because it has the best ground to the strand. The only way you should get sufficient V back on the cable like over 29V is 98% of the time going to be a poor electrical ground in or on the house in the electrical system and in most cases will either require the power Co. to check outside which is free to the customer or they need an electrician.
A easy indoor test is hook up a electrical circuit tester to the plug that feeds the cable EQ that has the voltage on it and it should give you a idea if the plug is grounded or maybe the hot and neutral is reversed.