Last year on the way to the ferry the coil on my camper failed which cost dearly as we had to rebook for the next days sailing,soon fixed with a £20 Lucas one,luckily I carry a points distributor to swap out as I didn’t know if the replacement is compatible with the Pertronix electronic ignition,which was only 2 years old! I’m reluctant to replace it with another Pertronix,with 2 years service and only a 90 day warranty! My question is,will any non ballast coil be compatible,I measured the voltage across , with ignition on but not cranking and got 11.4v.