You shouldn't need your hi level converter, your oem amp is pretty rugged. Your HU's wiring harness and the supplied harness from crtuchfield should be pretty straight forward. They are not all color coded, so make sure you are reading the labels, and not just connecting red to red, yellow to yellow, and so fourth. You are correct in wiring both the antenna and remote wire together. IF it still doesn't work you either have a blow fuse (not likely) on either the head unit or in the car. If those are fine, your deck is bad.