The only buttons are for "eject," "GPS," and "source." Since the GPS/sound system is made for the vehicle, it seems the RV manufacturer should have installed something extra to control which speakers are engaged. I have seen others that have a simple switch mounted somewhere in the RV that controls A B C (or both.) We have searched high and low but found nothing so far. Thanks for help.
My Jenson had the ABC choice any or all at same time just like Bob said
2016 Forestriver Sierra 376 BHOK
I would rewire the speakers. You should have stereo inside the unit and also outside. Use the Front Rear fader to turn off the outside or balance the sound between inside and outside.
B and B
2013 Rockwood 8289 Diamond Edition
GY D's/2.5 inch lift kit/Powerhouse 4 KW EFI Generator
2016 Ford F 350 Lariat Power Stroke Diesel Crew Cab FX4
2008 Golden Falcon 380PA Park Model Model "Oh Canada,True North Strong and Free!"