This is one of the more popular electronic ignition kits for the MG, as it fits entirely inside the distributor with just two wires running between the distributor and ignition coil.

If you elect to convert your car to electronic ignition, I suggest you put your original points set and condenser and hookup wire in a little plastic bag and keep it in your traveling tool kit, just in case. That prudent move could save you a lot of trouble if the electronics part should happen to fail some time down the road.

This part is available from many British car parts distributors, and may be available from almost any local auto parts store on special order. It may not be in inventory at local parts stores (which is one reason why you should carry your points set in case of failure). You must specify positive or negative ground when ordering. For more information visit the Pertronix web site

This circuit is for Negative Earth conversion only.

The Pertronix Ignitor does essentially the same thing as the original points and condenser, making and breaking the ground connection for the coil. It requires one additional wire to provide battery power to the electronic module. That wire is connected to the power input side of the coil (original white wire connector) for negative earth installation.

Apparently the Ignitor modules for positive or negative earth are the same except for the color of one wire. Being designed for negative earth connection, the positive earth installation must rearrange the wire connections to keep current flowing the same way direction through the electronic module. When you order one for positive earth application it comes with one wire in a different color and different instruction paper for installation. Click for Pertronix Negative Earth Instructions or Positive Earth Instructions.

Pertronix ignition can be static timed in the same manner as points ignition. Set the timing mark on the crankshaft pulley to the desired static timing position. Connect a test light to the switched wire running from the coil to the distributor (the one that is not the power wire) and ground the test light. Turn ignition on. Rotate distributor body anti-clockwise until light is out (equal to points closed). Then turn distributor body slowly clockwise just until the light comes on (equal to points open). Lock it down and run it.