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Hi there, sorry to hear you're having trouble,
can you please give me the model number of both the sirius radio as well as the tv?
Typically, you'll use the red/white stereo rca inputs (usually labeled Video, Composite, or AUX on the back of the vizio), and those will plug into either a matching set of red/white ports or a headphone type jack on the radio.
When using it this way, you'd need to set the tv to the proper input mode to pick up the signal (using the source/input/video button on the vizio remote, until it picks up the signal)
You should be aware though that this is not really a good idea. I would not recommend using the tv speakers for this purpose. For one reason, the sound just isn't going to be very good, tv speakers are generally poor quality to begin with, and they are optimized for low level listening, and focused on dialogue; they just don't sound very good with music. Secondly, you'll have to run the tv whenever you want to listen to the radio, with no video signal provided, so you'll be putting a lot of wear and tear on the tv screen (which will be displaying a solid blue or black screen) - this can contribute to burning out the screen, and it is a waste of energy.
You'd be better off investing in an external speaker system. You could go with anything from a small pair of computer speakers to run off the sirius tuner, or you could get a soundbar, which would allow you to improve both the quality of the tv sound, as well as run the radio sound through it (without having to run the tv).
Something like this:
VIZIO SB4020E-B0 40-Inch 2.0 Home Th... (click for link) is under $90 and would be ideal for your situation.