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To play audio from your DVD player through the 2238b, you will need to hook the RCA left an right outputs from the DVD to the Aux IN on the back of the 2238b. Then you will need to power on the 2238b and place the selector switch to the Aux position. Lastly, adjust the volume to a level you are comfortable with and that should be it.
I don't know how whatever accessories you have are hooked up but,
When I would run two batteries for my stereo in my car I had it connected to the auxilary battery. The isolators kinda **** because they are to send more power from the charging system to the battery that needs the most charge. They do not "isolate" as in makeing the system use one battery while not draining the other.
What I did was to hook a solenoid (mine was aftermarket but I think the old style Ford starter solenoids that bolted to a fender will do the same) inline of the battery cable so when my key was off one battery would be cut off from the other. That way I could play the sterio without draining the battery that started the car (the radio was on a rocker switch for when I needed to kill power).
Usually the way to do it is to connect audio out (Phono connectors) on the TV to audio/aux in on the stereo (phono connectors)
Of course to do this, both of the pieces of equipment have to have the right connections.
It really depends on the company who produced the radio. I know with certain types such as Kenwood, you have to get an auxiliary module that hooks into a pin-out on the back of the radio. However, if it is selecting Aux already, you may have a powered connection, so I would try hooking into the back if there is a spot, and see if it works.