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Also could be that the power wire and earth wires going to amp are to thin amp could be heating up and could be going into protection mode. Will switch on after it cools down what gauge wiring are you using?
It is hard to say. The sub-woofer has its own amplifier, although it is supplied the sound data from the main amplifier. It could have a problem with the battery power circuit (Sub-Woofer Amplifier Connector Pin 6, LIGHT GREEN/VIOLET) or it could have a problem with the GROUND circuit (Pin 2, BLACK/LIGHT GREEN) Or it could possibly not be receiving the signal from the main amplifier (Pin 7, BROWN/ORANGE "+"), (Pin 8, RED/BLACK "-"). Or it could be that either the sub-woofer speaker is blown, or the sub-woofer amplifier is defective. There is also a "High Audio Mute" circuit that connects between the main amplifier and the sub-woofer amplifier.
double check the ratings on the speakers and amp. speakers that size don't usually require an amp. compare the wattage and resistance numbers, if you haven't fried an amp, you may have blown a speaker. another possibility is a short in the channel. check wiring connections.
ok, your amp is in protect mode. either the speaker wires are crossed and shorting out, your woofer's vioce coils are melted and the speaker is blown or the amp is dead.
to determine if the speakers voice coils are melted, and thus the speaker being blown is the reason for the "protect" light, simply push in the cone of the woofer in gently with your hand. the woofer should move a little more than an inch, without any resistance, before bottoming out. if there feels to be any resistance, like a rubbing or scratching, before the woofer bottoms out, then your voice coils are fried, and you need a new woofer.
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.
you have one of two problems.1) the woofer is blown(most likely) or 2) the crossover is fried(rare). Take the woofer out and press on the speaker cone(softly). If there is a scratchy feeling when you move it or if it doesn't move at all, you'll either need a new woofer, or get that one reconed. good luck.