First check your ground wire then you power wire connections .. check the fuse to see if its making connections on both ends of the wires..
i think the flickering is the result of a weak or bad connection in the power ground or acc wire "normaly blue" your amp has no sound because the amp has to charge before it can out put at a higher amperage
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The first thing I would suggest is to check all connections to the amp and speakers, especially the ground. A loose ground can cause the problem listed. You can test this by temporarly running a ground from the amp to the battery neg. . If the amp fires up ok then that means your grounding point for the amp should be checked and cleaned and reattached firmly. If you have a meter(multitester) set it to ohms and check the impedances of the voice coils in the woofers. If one is cooked it may be shorted and tripping the amps protection. Always hook thing up with the sys off and then turn on and test.
You have a Direct Short in the System Between the Head Unit and the Amp. Check the Ground on the Amp and then Check all the Wires behind the Stereo and the Common Ground There. You could even have a Spot in the New RCA Cables that is Touching Metal Somewhere. Please Rate My Response! Thanks!
Does the amplifier do this when you don't have the sub hooked to it? If so, you have a pinch/short in your ground or power wire. If not, the subwoofer has a short in its voice coil or the amplifier needs to be repaired as it cannot handle a typical load.