Of course, the silly things should be checked, like that power is continuous, and your 12V Main and ground are secure. Also may want to check the remote wire to be sure that voltage is constant and at the proper voltage. If that's not the case, check your fuses, both on the amplifier and off the battery to be sure those connections are good.
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Apr 24, 2013 - Uploaded by Nathan West
My MTX 600xd amp light won't even come on. ... Red light comes on. ... one.. and some times it goes into protection... once I turn the car off...
If you are getting power to the amp, try this....Find a small speaker, unhook your sub and wire speaker to amp. Turn on your system at a low volume....If the other speaker is playing through amp, then your sub is shot.....If the small speaker doesnt work, then its either your channel is gone on the amp or the rcas have quit off off your head unit.
If your voice cuts off when you use too much power i.e. operating power windows you are taking power away from your amp. An amp operates in stages; therefore you must increase the available (battery) power in your vehicle; possibly you can run two batteries (do not connect them in series)
if your amp is overheating your sub is needing to much power that the amp doesnt have.
if its cutting out and the red light comes on you need to check the wiring. nothing not even the tinyest speaker wires can be touching.
proper wiring would be your best bet.
but i would upgrade amps.
cheap bang isnt reliable.
Caps are NEVER a solution to ANYTHING in a car audio system. If your car is lacking in power, you need a high output alt. All caps do is mask the problem until eventually your car's charging system is toast.
Check this out: http://www.techlore.com/article/14696/