I'm having trouble with my amp. I installed it and ran all the cables so I know the cables are right. I tested the wires, the power has 12 volts, and the gound is grounded. When I turn on my radio, the remote wire reads 4.5 volts, and reads that at the amp. The amp never turns on, but when I test the power and ground, they read 5 volts I really don't know what that means at all, the power light on the amp never comes on. When I turn the radio off, the power and ground go back to 12 volts.