what part of the ignition system amplifies the electrical voltage
The power stage, or ignition amplifier, is located on the inside wall of the engine compartment just above the drivers side wheel well. The ignition control unit sends a signal to the power stage once it is aware that the engine is turning over (by the hall effect sensor [pre 88] or the RPM sensor [88 onwards]). The power stage then amplifies this signal and sends it to the low voltage side of the ignition coil.