Hi there I am usually quite familiar with sound installations but this one has honestly got me dumb founded. All wires are connected correct ie the 12v,gnd, and remote as all amps turn on accept one which was purchased yesterday. I thought it was faulty but if i test it using a 12v inverter it powers on no problem however the minute i plug it into the car it doesnt work even if I use the same cables which is on the other amps which actually turn on there is just nothing. Yesterday when I put the ground on a got a flash of red on the protect light but since then nothing can anyone help as the shop wont take it back so any advise is welcome