Popped the multimeter on the wires and flipped that toggle switch. 13.69V. Wired the 12V adapter back in, hit the switch again and everything is now good! Planning to store the indoor antenna and the power line inside that cabinet when not in use, and run the wires under the velcro flaps to the spot on that fridge wall where I am going to mount the amplifier bracket.
I did the measurements and the slide-out has ample room to close with the bracket in place, though not the amplifier itself. I’ll pop the amplifier in and out as I need it, and stick it in the sock drawer or somewhere when I don’t.
I have discovered that the speaker on that side doesn’t work. Nothing I did, since it looks like someone previously cut the power to it. Why? Probably doesn’t work properly (why would that be a surprise?). The splice connector in both the hot and ground wires had a cut off wire in them, with the only wire left going to the light fixture. Won’t know what’s actually going on back there without pulling the speaker. My head is too fat to fit inside the cabinet and really get a proper look.
I will go back in at some point (probably when I wire in the new lights) and reconnect the speaker. And see if it works…. A trip to Home Depot for a few meters of 12 and/or 14 gauge wire is in order. Always nice to have lying around
So a lot of the project done. Waiting on the flexible conduit to arrive to run the outdoor antenna wire from the battery bay, under the trailer and in through the space behind the fridge.