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Why not just hook to the harness for the factory sub that's in the back driver's pillar? You don't even have to take the unit out, and just enable it with FORSCAN and you're in business.
So after digging around this forum more, i stumbled across a post where they said you have to hook into the CD player, not the back of the screen. I took out the CD player and sure enough the harness we bought plugged right in and we were in business!! This truck didn't have a factory sub so there was no wiring available. The only issue we had, is that the amp came with a fused connect for the blue remote wire. The fuse was a mini fuse but the fuse box we ran to with the accessory wire was a micro fuse..... so we ended up ordering a micro fuse connect and now we r good to go!