"I have a 1989 Mercury 40hp (4 cyl) outboard that will not start. It does not seem to spark. It ran last fall, this spring it will not run. The only change is a new starting battery.
If I pull a plug and look for spark against the block there is nothing (on all 4 plugs). All 4 plugs have good spark if I test them on the push mower.
The coils seem ok. (short between +/- terminals and between coil tower and either +/- it is open).
The trigger values are 800 ohms between brown and white/black trigger leads as well 800 ohms between White and Violet trigger leads
The stator readings worry me. I have open between Blue and Blue/white and 135ohms between red and red/white. What are the correct readings for the stator? Also is it possible for the stator to just stop working over winter?
Once again, the only change from last fall when it work and this spring is a new starting battery."