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disconnect the speaker wires from the amp, and check for power. there is no resetting, other than simply turning the amp off and back on. if it powers up fine without the speaker/sub(s) connected, check your wiring and check the ohms with a meter. if you do not find a problem there(should read within 1ohm of how you wired it) then check for dc voltage coming out of the speaker terminals on the amp. should also check that the amp is getting good power and ground. if wiring and speaker(s) check out okay, then the amp is damaged. if you get dc voltage from the speaker terminals, the output transistors are shorted out and it needs to be repaired by a tech.
Find and check the internal fuse....make sure you have a constant 12v+ (big red wire) when the ign. is OFF,and a switched 12v+, and a GOOD ground. It should make a clicking noise as it powers up.....if not, it's a boat anchor......sorry.
you have an unloaded channel,so the voltage is exceeding what the protect circuit is supposed to see.you have to connect an 8 ohm resistor across the output of the unused channel.
do not drive a signal into it or you will smoke the resistor.
a 10 watt will do ok with zero signal input
With your multimeter set to DC volts and the black meter lead on the ground terminal of the amp, touch the red lead alternately to the B+ and remote terminals as the amp shuts down. If the voltage drops below ~11 volts, you need to check the wiring feeding whichever line is dropping 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.
Have you opened the unit to take a look inside? Since you dont have a blown fuse we cans assue the a short has not occured. Now I would chect to see if the voltage regulator in the amp has voltage coming from it. It may not in that case you may have to remover the old regulator and put in a new one just to get to the point of properly troubleshooting this amp. I would suggest that you get a schematic for this unit and use a multimeter to look at the voltages in the power supply section and see which sections have no rail voltage (12v supply voltage). I would also advise checking the remote to for regulator failure.