Another what's this plug...

[Speedling]

Messing around in the back of my boat to get my new reverse bucket cables and trim tab wiring i see this plug. No idea what it goes too. Second owner of the boat so wondering if something aftermarket was in rear bilge area?And yes my hands are huge. I carry blocks around all day.
It's the plug to the right. The two grey ones are the cutoff switches for cleanout tray.

 

[Dixie Highway]

Well it doesn’t look like a current Yamaha plug, looks like an older Molex. I believe Yamaha uses Deutsch (had to look up the spelling to get that one right) like what you see for the clean out switches there. I’m certain you already tried tracing the wires to see where they lead.

 

[buckbuck]

Possibly the rear stereo remote?