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you need a hi-lo adapter and that hooks up to the right or left rear speaker then the remote wire needs to go behind the deck to the ignition wire. if the system is pre amp then you have to bypass the amp system
To check for yourself, get an Ohmmeter and see if the outers of the amplifiers RCAs are connected to the ground or each other. If so then it cannot take speaker signals directly.
I suspect the 'High Level' the manual speaks of are the 4volt auxilliary audio signals that can be found on some newer head units, not speaker signals.
Speaker level signals from a bridge amp CAN be used on grounded RCA inputs if the signal is first passed through a simple decoupler and attenuator.
Diagram to explain....
The accessory wire that you are looking for is the one that tells the head unit to turn on when you turn the key in car. If you have an aftermarket deck then the deck has it's own for the amp usually it is blue and in your case may not be connected to anything. If you don't have an aftermarket deck you will need to find a wiring diagram for the car radio harrness and it will be labeled. You dont want to use any random wire because if that wire always has power your amp will stay on and kill battery. You can wire a switch if you choose this method to prevent that from happening. You may also try running a wire from main power of amp to a small fuse (remote uses less than 2A) then to a switch and then back to remote screw of amp. This website has wiring diagrams but colors dont always match. http://www.the12volt.com/ Good Luck
hi input wiring hooks up to speaker wire outputs on the stereo. in 2008 chrysler has no ignition or accessory outputs. everything is digital, if you use a trunkloc from PAC electronics you will be able to hookup your outputs from the deck into this unit and it will provide you with the RCA, and remote power output needed for your system to operate. the factory deck should have battery and ground at the plug but no acc.
depending on the power consumption of the amp u will need to run a 4-12 ga wire to the positive battery terminal. then u need to ground it with a wire connected to a clean ground like a chassis bolt. next u need preamp outputs on ur deck to send audio signals to the amp. lastly u need to hook up a remote wire to the blue wire in ur cd player harness