Rinse those wires in a product called Tarn-X it will remove the corrosion. Just seen it done and it works great.Hi all, BearZahn from Brisbane Australia.
Have a project 1977?? 850 merc rebuilt power head, leg, working on timing and corroded wires on stater. Might have to try removing black compound to get to non green wires reseal. Any comments as to how good or bad these 850's are.