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Couple comments. Easiest approach is probably to hire an electrician with the appropriate equipment to locate an underground fault. The equipment is fairly sophisticated & not something you would want to buy to use once. Never heard of using spark plug noise. Modern ignition systems do a pretty good job of suppressing interference - how long has it been since you've heard spark noise in an automobile AM radio. I doubt very much that one would put out enough energy in the AM radio band to be detectable through several feet of earth. Using an ohmmeter for something like this will likely just lead to a lot of confusion. The resistance of 350 feet of 2/0 aluminum wire is roughly 0.05 ohms. This is way below the accuracy of even a good quality ohmmeter...just the contact resistance between the ohmmeter lead and what your measuring is a lot higher than that. In addition, a fault may not be a hard short, and wouldn't show up with the low voltage used by an ohmmeter. Looks like you either need to start digging, or cough up some money, neither of which sounds like a very attractive option. Good luck, Keith
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