I broke down and wired it to the reverse lamp, and it worked for about 10 minutes. I had it in reverse and was gonna snap a pic or two and it went out and back to the same staticky lines I had before. I have no idea at this point what is up. Hooked directly to the battery for test, and it worked fine and never went off. It's like the power is fluctuating in the wires and causes it to flicker out. Making me wonder if there's a battery or alternator issue keeping constant 12v going. So much of the Denali is electric, it wouldn't surprise me if it's all just making the system strain a bit.