according to this, it's behind the glove box?
http://documents.victorytechnologies.com//documents/product/2330.pdf
and here's the wiring:
Ram 2006-2009* Behind glove box
Wire Colors for Bypass Harness:
Brown/White**** ................Center Speaker (+)
Blue Dark/Pink**** ..............Center Speaker (-)
Yellow/Blue Left Front ............Tweeter (+)
Yellow/Black Left Front ..........Tweeter (-)
Yellow/Red Right Front ...........Tweeter (+)
Yellow/Orange Right Front ......Tweeter (-)
Green/White ........................Subwoofer (+)
White/Red ...........................Subwoofer (-)
Brown/Yellow .......................Not Used
Brown/Blue ..........................Not Used
.
NOTE
The factory amplifier has the crossover built in. When
bypassing the factory amplifier be sure to use crossovers to
protect the factory speakers.