MerCruiser Engines - electronic parts catalog
Took me for ever to find this reference goldmine. It's the same one the dealer uses but you don't have to have a login/password to get in.
Use your serial# to find the right catalog inside the folder structure...
Boat: 03 Sundancer 380; Gas MerCruiser 8.1S Horizons
Owner for 33 months, Moored in freshwater, cruise in salt water
Aliya here. New to the forum but have met many of you at SeaRay events. I'm pretty darn handy and have fixed the generator, done electrical and crawled in spaces you shouldn't be...