When I had my issue I checked for that and an in line fuse in the bilge area. Fuses were fine, could not find amp settings on the radio only stuff like time, date, sound settings. There is a green light on Clarion amp I have which lights when powered...
I had the same issue with my 225 Weekender. My woofer was blown and needed replacement. Also the front cabin speakers were wired to the radio head unit while the cockpit speakers were wired to my amp. After checking all connections, speakers, wires ...
Google brought up this diagram. I'm sure if you go to the Mercury/Mercruiser site you can find the real thing. Hope this one helps.https://www.marineengine.com/parts/mercruiser-sterndrive-parts/50l-mpi-alphabravo/0m300000-thru-0m599999/thermostat-and...
The plastic connector on the engine bracket is used so that the other plastic connector that fits on the water hose pushes into it. The end result is a quick connect/disconnect connection if that makes sense. They basically lock together on the metal...
