You may think I am in the wrong area for this thread, but this is not about ghosts per say. I was working on a large battery system that is suppose to be floating in referance to ground. These batteries are gel cells and are haveing problems with leaks. These leaks are causing ground faults in the system. I was trying to troubleshoot the problem using a multimeter measuring the voltage from ground to the posts on the batteries. In theory the battery that has the least voltage or where the voltage flips from posative to negative is the location of the ground fault. I found several readings like this and thought I found my ground fault. I left and came back and the low or flipped point has moved with out any interference from me. I was confused and thought there was more to this that meets the eye, so I conducted some research and found out that this has been labeled as ghost troubleshooting and no true procedure can accomplish pinpointing the problem and only experience can make it happen. Has anybody herd of this? I realize that ground is a general term as far as voltage potential zero. I would still think the ground fault would still be in the same location though? Any wizzards out there no the physics behind this?