That's got me thinking. You said that the truck sat for a few months with no battery connected, so chances are the head unit has lost all of it's previous settings. Most newer ones have a memory function but in my experience it's never really good for more than a few days. You could look through your settings and make sure there's no way to toggle the subwoofer function on and off, or a way to toggle those rear outputs on your head units to sub outputs instead. I doubt this is actually the problem though, I believe that all head units will always send a turn on signal over the remote wire when they are powered on regardless of settings. It wouldn't make sense to disable the remote signal just because you didn't have subs enabled. If that were the case you couldn't run an amp for a nicer set of front speakers, etc. I also would not worry about the faceplate. If you test the remote wire and it has power from the head unit, then my next suggestion would be to trace your amp's ground connection. My money is still on the remote wire, though.
Last edited: