When I connected the amplifier with my car radio and sub-woofer, the 3 lights on amplifier are constant turning on and off, but the woofer only gives sound when light power is turned on and that is like 1 second on every 15 seconds...
You might check your ground cable for poor connection. If it is attached to the painted chassis of the automobile, the paint needs to be scraped off a little. Or go to a local audio shop or Walmart and buy a cheap capacitor. It is supposed to hold power in itself providing the amp constant power for just this reason.
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If the amp is in protect mode, it probably has shorted output transistors. To eliminate other possible causes, do the following. Disconnect all speaker wires from the 'amplifier's speaker terminals' and disconnect RCA/signal cables from the amp. If it powers up normally, the speakers/wiring need to be checked. If it still shuts down (goes into protect mode), the amp almost certainly has shorted output transistors and will need to be repaired. You also need to confirm that you have sufficient power supply voltage. With your multimeter set to DC volts, the black meter probe on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red probe alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts on either the B+ or remote line, you need to check the wiring feeding whichever line is too low. If 'both' the B+ and remote turn-on lines are low and your battery is fully charged, you may have a bad ground connection.
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