I bought a used Tesroro many months ago and just got around to getting my first chance to use it. I turn it on and get the battery test tone but it keeps going on and on. It doesn't cut off after 6 seconds or so. It doesn't do that when the coil is not connected so I'll assume it has something to do with that. Any ideas on what to look for when this is a problem. Everything looks ok on the inside of the panel board so I'm lost. I' d like to have this money go down the drain. I am handy with a soldering iron so have at it.