This may sound a little crazy but I have seen it before with results so if anybody has any comments or experiences, let me know. We used to take two pieces of number twelve wire about a foot and a half long and bend a couple of inches on the end at ninety degrees. Then walk across the area you think it might be in and hold the wires in each hand loosely. When the wires moved in together towards each other then we dug straight down and there would be the pipe with the wires. Saw it a couple of times and it seemed to work. Something about magnetic fields? Try to stop laughing ok? Kinda on the same principle that people who search for the right spot to drill water wells. Kooky?
I don't remember exactly how this worked, but another member previously mentioned this unorthodox method in a similar thread: I have never done this, nor do I plan to ever do it Disconnect a spark plug wire from the truck (w/ engine off ). Run a jumper to the UG wire (be sure to disconnect all the other connections to the UG wiring) Start truck, and walk along with an AM radio that's tuned off of any channels. The "ticking" will be picked up by the radio, and will be louder the closer you get to the UG wire.