have a 1986? (0A131197) 4 cyl. 50 hp merc outboard (brown band). diagrams in books do not quite match wiring. have 4 wires from stator, not six. two to rectifier and two to switch box. Cyl. 1 & 2 not firing. How do I diagnose if stator, switchbox or trigger? Diagram would be greatly appreciated and any advise would be most helpfull. Thanks, JEFA