Check connections behind dash, especially ground. Make sure no wires are crossed/touching, and make sure all connections are strong. If still a problem check grounding from battery to frame....maybe even consider running the "ground" wire from your CD player to your frame.
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Do you have power going to both the red and yellow wires? The red wire generally goes to a switched power source and the yellow should be constant. Both wires need to have power going to them in order for the unit to work properly.
open up your dash get 1 short RCA cable (red and white) male ends on them
now place the red and white RCA into the back of DVD in-dash player next step the aftermarket CD player should have 2 rca plugs that say aux put the other end red and white RCA cable that you just put into DVD unit into the aux inputs on back of CD player when this is done reinstall both units back into the dash now on your CD player press the source button till aux appears once this is done you will hear the DVD player sound...........now if you press the source button and no aux appears......hold down the source button till the CD player powers off...........once CD player is off hold down the F (function) button till beep or unit turns on a display use the skip buttons or F (function) button to go threw features once you get to aux turn aux to on now hold the source button down again till unit powers on normally once this is done press source button again till you find aux........if you get sound and the TV doesn't work let me know and ill guide you to get that running too (if there are no aux RCA plugs on the back of CD player) let me know (sometimes there is a headphone looking plug on back of CD units) if what i told you doesn't work let me know the brand of CD player you have so i can give you correct setups I'm only going by your in-dash DVD player right now
hope i was able to help get you sound
make sure the speaker grounds are connected to the speaker ground wires on the deck and not the "chassis" ground. also make sure both power wires are hooked up to a power source. the thinner power wire is supposed to be a switched source (like the ignition key or an accessory switch) that turns the unit on and the thicker one is a constant source which actually powers the deck once the switched source is turned on.
As a sanity check run a temporary wire directly from the battery positive to the radio. Twist the red and yellow wires together and connect it to the wire from the battery. If this works either your red or yellow wire connection under the dash or to the harness is not hot like you think. Yellow usually goes to a constant 12 volt source (to keep radio memory) and the red wire to 12volts when the ignition is on. In some radios this is reversed. The test I mentioned will determin if the problem is in the wiring or the radio.
Any after-market CD player needs voltage on the yellow wire and on the red wire before it will turn on. The yellow wire is for a constant power source, and the red is for a key-switched power source.
When you hook it up to your battery using only the yellow wire and the ground wire, it's similar to having it in your dash without turning the key on; ie, it will load and eject, but won't power up and play with the key off. Turning the key on sends voltage to the red wire.