I've got an old Echo that I'm restoring. It has a rather bizarre spark problem. If the 'Off' line is disconnected from earth, no spark. If it is connected to earth, still no spark. If a nail is inserted into the Off line connector and held a couple of mm from an earth point, a spark will jump between the Off line and the earth and at the same time a spark is produced at the spark plug.
When I brought this trimmer home, something hit the Off switch and broke it (I've taken it off and just left the line). It originally had a connector for the Off line and it's body earthed to the trimmer chassis. As there appears to be little wear to the electrical system (looks almost new) I'm wondering if maybe the On/Off function worked by creating a spark within the switch (which in turn causes the spark at the plug) rather than a traditional short-to-earth. Does anyone own one of these or have any idea of whats up? Any help is appreciated.
