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DID THIS JUST HAPPEN ALL AT ONCE ? OR DID IT GRADUALLY HAPPEN? CHECK GROUND FROM AMP , INSTALL ONE FARAD CAP . STOCK RADIO ISNT REALLY HELPING , MOST AMPS OF TODAY TAKE A HIGHER SIGNAL FROM HEAD UNIT . ADD ONE FARAD CAP AND SEE
Generally, the power light is green and the protect light is red. If the protect light is on there could be a short in the wiring or there could be an internal fault in the amp.
Disconnect all speaker wires from the speaker terminals of the amp and disconnect signal cables from the amp. If it powers up, the wiring needs to be checked. If it still shuts down (goes into protection), the amp likely has blown output transistors.
With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage drops below ~11 volts, you need to check the wiring feeding whichever line is too low.
If the voltage remains near or above 12v, disconnect all speaker wires and signal cables from the amp. If it powers up, the wiring needs to be checked. If it still shuts down, the amp likely has blown output transistors.
The Protect light would normally be Red. You need to test your RCA's and make sure your getting a signal to your amp. I would just buy a new set or if you have another set just try them. If you get your amp to power on and all of your voltages are right with the proper signal and your amp fails to turn on you Have a bad amplifier
Exchange the amp it is going into Protect. But your sub may be causing this problem if it is shorted. Make sure your subs are wired to at least a 4 ohms. Only a shop can tell you for certain if your sub is shorted or not. But if you are smelling smoke then that amp is already toast.