Quote:
my new Dodge Charger

If it's anything like Tod's Dodge Durango, the problem is that the factory amp needs a higher power level going into it than regular line level, so you need a little in-line amplifier. It's more than just a wiring harness, it's a set of wiring harnesses that go on either side of a little interface box that amplifies the signal a bit.

Of course, your model could be different.
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Tony Fabris