The first thing to do here is to separate the negative battery cable from the battery and remove it so that it cannot touch the negative terminal of the battery by mistake; by doing this, power will not flow in the vehicle's electrical system again. The next step is to disconnect the ignition coil electrical connector, and unplug the high tension lead from the coil. Thirdly, take out the coil retaining screws and subsequently detach the coil. Lastly, installation requires following same steps as given above.