Looking to do the same thing...install aftermarket headunit and replace premium amp with LUX amp. I have a 2005 GMC Sierra. Are these the wires you swapped...http://duramax.onlinedesk.net/navinstall/AMP_harness_MODs.html?
I ordered a Metra/Axxis GMOS-04 to interface the HU with the lux amp...
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