Most tether kill switches sold are normally open with the tether key installed. Once the tether key is removed, the switch will close itself, creating a short to whatever circuit it wired to. This should not be used to ground the high voltage signal to the ignition coil. WARNING: Installation of a grounded tether kill switch to the ignition coil signal will damage the ignition. Consult your individual instruction manual for specific wiring instructions. RECOMMENDED: Magneto- Source coil CDI (Banshee / 400EX / 250R / MX bikes / etc): Use a NORMALY OPEN tether kill switch connected to the stock kill switch. When tether is removed the switch should ground the kill input into the ignition. 12V DC-CDI (Raptor / Z400 / KFX400 / ETC): Use a NORMALLY CLOSED tether kill switch connected in series with the +12V input to the ignition. When the tether is removed, it should disconnect the +12V power to the ignition. Most battery equipped quads have a RUN/STOP switch which disconnects +12V power, a NORMALLY CLOSED tether switch can be installed in series of these wires.