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actually, chrysler/dodge has factory Infinity sound systems installed. The nice part about these systems is that you dont have to bypass the amplifiers in order to put a new radio in, but simply power up the amp by hooking up the amp turn on wire at the harness. The alpine should have 2 blue wires coming off of the back, one that is solid, the other with a white stripe. The one that is solid only has 12v when the fm/am radio is on (used for power antenna) but cuts off when other sources are used (cd,aux,ipod). My guesses are, you have the amp wire on the vehicle harness (blue) tied into this wire, instead of the BLUE/WHITE wire on the alpine which has 12v as long as the radio is on. i hope this solves your problem, 9 times out of 10 on a chrysler this is it.
you have the amp remote wire hooked to the power antenna lead instead of the amp wire on the deck otherwise just hook it to a switched +12 volt source. You sure you got a DVD changer instead of just a cd changer
The Alpine has two tigger wires when it turns on. One is an AMP TURN ON wire (blue/white) and a PWR ANT wire (blue) and that wire only comes on when using the radio or an optional HD radio unit ... When it was installed/connected . someone hooked your amp turn on wires for your "full range amps" to the PWR ANT wire. And the sub amp trigger is either hooked correctly to the AMP TURN ON WIRE or somewhere else, it probably shouldn't be... Check it. Amp triggers should all be to the blue/white wire from your alpine. Warning: Alpine trigger wires, are very easy to mess up they supply a very limited amount of power.
Your amp is not turning on - what you should do is connect the "blue/white - remote turn-on lead" to whatever wire you have the "blue - power antenna" output from the Alpine connected to now. That should solve your problem.