Units Model

Can two audio head units share a speaker system in a late model GMC truck without prejudice to any of the units?
I have Sierra 2003 with a stock AM / FM radio with RDS that uses the speaker system for transmitting information signals, such as a ring tone when fuel is low. units aftermarket head requiring a special adapter to connect expensive if you want to keep that role. Could not I just install another unit with a CD player in the truck, and share the value system of the speaker? I worry if the feedback from one unit to another may cause damage or other problems.
In theory, you could connect to the same speaker system, but you will want to put some type of switching system to avoid any ground or noise problem. At the time of installing the main unit 2 nd and all cable correctly, you have to think twice before buying only the connector single-sided.
Two Serendra Model Units
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