Hi I have a 12/50 herald with optronic lumenition and I'm getting no Spark at the plug leads.the unit has a good earth and a good ignition live 12v.
The coil is a 3ohm coil with I swapped for a spare I had but that was a 1.7 ohm to see if it made any Spark and it didn't.
Can anyone suggest any other checks to determine the fault, cheers Tim