The maximum rating for the wire fuse is 10 amperes. It went over that mark. Two areas then drawing volts from, the remote wire to the amplifier, then RCAs which is the signals itself also requires volts going through it. It should go with color to color on the blue-white wire to power amplifier on the radio and factory side harness. You connected it to the amp instead all the way from the fuse box. And there's no power red wire then? Larger power wire used from the battery to the amp, and a ground wire from the amp to the ground, should be enough power. Did you try that first or just hooked up the remote wire like that? How to check for ampere ratings? set up the + and - leads as a series connection to any part of the loop going into the amplifier. If you need to buy more amplifier cable, then buy more amplifier cable to check that ampere going through it. Seeing the total ampere going into the amp. Volts, is checked by measuring it at the ISO connections. Place the probes in the slots. + and - together.