I've swapped the harness over and done all the wiring. Everything looks correct. The unit is getting power...and the ground checks out. The fuse looks good.
It won't turn on though. Is there anything else I might be overlooking?
Before I had wrapped all of the connections, I tried to turn it on to see if it works. It turned on, and all seemed well. Then I moved it a bit and the unit said 'failure' (as it does when you turn the volume up too high) and turned off. It won't turn on since.