Forestg have you seen the multiple threads with wiring diagrams on this forum on the Duraspark (do a search)....George /Mr.Cowboy posted some very good info on the two systems and doing conversions from the dual point systems to the Duraspark. I recall as Doug said, there are two different modules and there are some minor difference between them...but I want to say the better one is the Duraspark I module due to the performance features.
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