Quote Originally Posted by shawnrw View Post
The moomba boats with the RA70 head unit only have 1 power wire with no ignition signal wire as most head units have. It’s wired where the power wire is only hot with the key on ACC or Run, checked with a voltmeter. It's odd, but the breaker is not getting power unless the switch is in the positions mentioned above. Curious on what their engineering reason was for wiring it this way.
This might be true for newer boats but my 2015 was not. The yellow and red were connected via factory harness and landed on switched power from the key.

I have since separated them so yellow is constant power and red works off an aux switch that wasn't being used. This way I can listen to the radio without the key yet all power is removed by the main battery switch. Fusion recommended this so A) it doesn't keep surging the new stereo (I went through 2 if them in a month) and B) you only power the music while floating and nothing else has to be on. The radio also doesn't surge while starting or turning the key from ACC thru Off to RUN. Again MLA is correct the 15a requirement is on the yellow wire and should be from a good source (i.e. radio fuse) but red draws minimal current and is wired to a 5A factory toggle switch.