I have a 85 mercury 50 and i'm having problems getting spark on the top 2 cylinders. It is a 4 cylinder. I have replaced the stator already thinking that was the problem. It will idle fine and rev up and not miss but when you put the boat in gear it winds up but won't get on plane. Its on the back of a aluminum bass tracker and the boat will usually run around 40mph. I'm thinking it may be my switchbox but i'm having trouble telling if its bad. all the coils work because i have switched them around but still can't get fire on the top 2. is it possible it could be a rectifier? the trigger also tested fine.