Amp not powering up (new install)
Does that remote wire on the back of the radio connect to the yellow wire on the stock harness. If not try connecting to the pin for the yellow wire on the stock harness, not the harness adapter. The yellow wire on the stock harness is ignition controlled power and will turn the amp on and off with the turn of the key assuming everything else is right which sounds like it is.
Others can use the pink wire in some instances which is the power antenna wire but the JVC unit turns the antenna off when switched out of radio mode which will effectively turn your amp off also so you can't use that.
I'm pretty sure that's your problem!
-Ian
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