Pioneer 4400 I ran 12.4 volts constant to HU and 12.4 volts switched when I got to third wite to land , the ground it had 8 volts on it . No amps no rca"s landed yet remote site also reads 8 volts at head unit and back by amps . Power from battery to amps 12.4 leaving 10.4 arriving . Amps won't turn on at all