Ignition coil insulation leakage test : 1. Connect the arrester and ignition coil according to the wiring . The arrester will flash normally. 2. Connect the negative electrode clamp to the ground socket, move the negative electrode clamp close to the ignition coil insulating rubber sleeve 3. If the negative electrode clip flashes and the discharger stops flashing at the same time, it means there is insulation leakage here. Colour:Black Material:Plastic Package Contents: 1 * Ignition arrester Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. Sockets 1/2/3 are all ignition coil high voltage positive sockets Socket No.1, flashover voltage 25KV-30KV (old style ignition coil) Socket No.2, flashover voltage 30KV-35KV (currently mainstream ignition coil) Socket No.3, flashover voltage 35KV-40KV (high energy ignition coil)