Electrical fried for third time

Run a heavy gauge fused wire directly from your battery to an installed power block in your trunk. Then a out of that to a 50amp I believe, fused line to your amp. Problem gone!!! Run a line from the radio from the auto antenna, usually a blue wire, if it has one, to the on/off line of the amp. This way when you turn on your radio instead of the power antenna going up it powers your amp on. Good luck!!!