Originally Posted by
CastingCall
Did you test the alligator clip power cord that you found? From what you described, that cord would be replacing the 120v wall plug cord, yes? Does the 120v cord have a transformer plug, or just a plain power cord? If just a plain power cord, then it would seem the "power box" contains a transformer (120vac input to 12vdc output) - in which case, going from a 12vdc battery to the power box wouldn't work.
Is the power box also the receiver for the remote control? Maybe post a link to the Amazon lights you have for more info. Not clear if you need to ditch the whole power box or not.
If you don't plan on hooking up to any existing switch on the dash, and you hook direct to battery, then install a waterproof in-line blade fuse holder at the battery on the + line.
Personally, I'd hook up to a switch regardless of remote control. Remotes can be quirky - being able to cut power manually when not in use prevents accidental power draw if the remote/receiver acts up.