If you are not getting sound out of them I would say the amps have failed internally, many have fuses on them and fuses on the boards inside as well. For testing you need to see if you have audio from the head unit to the amps inputs, for that a couple small speakers should work fine, just connect one to the heads output at the amps input and the other to the amps output. If you have sound at the inputs of each amp but nothing coming out, the next step would be to run a power bypass line from a battery to each amps power, that takes the vehicle power and wiring out, Connect the amps remote power to that as well so they are turned on, then test again. If you still get no sound out with the power bypassed and using test speakers and knowing there is an input signal then the only thing left would be if the amps are damaged internally. It would be the same as connecting them outside the vehicle for testing.
How are the amps turned on? Remote activation through the head unit or? Check that circuit as well.
Saturday, November 21st, 2020 AT 12:08 AM