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The run capacitor is not a mechanical device, so the clicking that you are hearing is not actually coming from the capacitor. If you the wires going to the capacitor, (isolate the capacitor), you can check the microfarad rating of the capacitor to ensure it is still good using a multimeter. Hope this helps.
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.
Sounds like you may have a shorted switching Transistor in the switch mode power supply causing a short to ground. If you are technical enough. Remove power remove cover and do a continuity test on the transistors on the heatsink. non of them should read zero resistance between the three legs. in all connection configuration you use to hook up your meter. If one or Two or even all of them do you must replace with proper part.