COIL IGNITION 24V FITS ALL WATERPROOF MODELS
These 24 volt coils have been a problem for a few years now. They are not suitable for use with electronic ignitions, even the military-supplied electronic ignitions as used in the M151A1 and A2.
They work fairly well on a system with ignition points. One thing to be sure of is that you have your ventilation/fording system completely in tact because without the fresh air coming through the fording system, the coil will overheat.