I have a 2013 Jetta TDI with the Fender System. I have an aftermarket head unit that has been powering stock speakers and sub. I have decided to upgrade to a Boston G2 Sub and aftermarket amp. I have all lines ran from aftermarket head unit to amp and sub; amp powers on but cannot get any signal to the amp to power sub. Amp is not going into protect mode and stock sub is unplugged… anyone know what I’m missing and why I can’t get any signal to my sub? Do I need an LOC? I’m at a loss here.