Hi Bushy,
I have no idea how the module picks up the signal it senses it as the magnets pass the coil (very clever little things) It may not solve your problem if the coil is the problem but at least it will rule out your points, condenser being the problem. This is step one in fault finding and points and condensers are a bit hard to find these days
Thank you again Norm for your advice. Are there any instructions on how to swap out the points and condenser without cutting existing wiring, and where the best place would be to locate the replacement ignition module?
My thought would be to cut out and shape a flat piece of metal to replace and match the existing condenser and points plate, allowing them to be kept in case of other issues, and mount the new ignition module on this plate using the screws and mounting point of the old plate. This would keep the mower looking original, but will it then need a cut-out switch or just let the fuel shut off like it does now???