I don't know anything about your coach, so I am just guessing here. I assume the Quest three way splitter is a coax switch?
If I was connecting a DVD player in the coach, I would connect the HDMI (or the component video) output from the DVD player directly to the front TV, and use the coax connections in the bedroom and outside TV's.
The HDMI connection is digital and will give you the best video picture and sound. Component video and stereo audio will be the second best. Coax (with the TV tuner set to channel 3/4) will be the worst in video quality. With larger HD capable TV's, you will see the difference. Hopefully the manufacturer did that for the front TV.
With your DVD playing, I would try switching your TV to the various A/V inputs, and see if that is the way Thor connected the DVD player.
Have fun with your new coach.
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Jim A
'04 Alpine Coach 36' MDDS
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