Hi to everyone, first post.. Am learning how to rebuild my 1980 johnson seahorse.. Have removed old coils and cd2 pack but when installing replacement parts old plug has 4 pins from the cd2 pack and new plug has 5 pins.. Just need to know what the extra wire is? Is it another earth? Does anybody have any wiring diagrams or anything that could help me with the coils and cd2 pack? Thanks Jason