Question about Rockford Fosgate T20001 bd Car Audio Amplifier

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Amp shut down no visible damage

My amp recently just went dead.  I checked all the wiring tested the remote and power cables have power I have it connected through a tsunami 40 farad cap along with a t4004 fosgate amp no problems with it.  I took the cover off nothing is burned fuse is good. None of the lights come on when powered nothing at all any ideas?

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  • Anonymous Apr 22, 2009

    I was repairing my speaker, and when i put it back in the box and tested it, it was fine, then when i hooked the other back up to my amplifier,it played for about 5 secs then the power to the amp was lost, on the way to school sometimes(Not very often) it would cut, now the amp wont get power(come on). The green light nor red light comes on. The connection is good, and the fuses, so whats the problem

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1 Answer

Its blown send it in

Posted on Nov 05, 2008

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When i put on power protect light come on


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. If the amp only shuts down when it's driven to relatively high volume, you 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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1 Answer

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Jun 17, 2009 | Rockford Fosgate Punch 301X Car Audio...

1 Answer

My amp is on protect!!!


If the amp is in protect mode, it probably has shorted output transistors. To eliminate other possible problems, 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. If the amp only shuts down when it's driven to relatively high volume, you 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, 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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1 Answer

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When adding (Amplified Powered Equipment) to your car you have to in most cases:

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1 Answer

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If the voltage remains near or above 12v, disconnect all speaker wires from the speaker terminals of the amp and disconnect signal cables from the amp. If it powers up, the wiring needs to be checked. If it still shuts down, the amp likely has blown output transistors.

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If the voltage remains near or above 12v, disconnect all speaker wires and signal cables from the amp. If it powers up, the wiring needs to be checked. If it still shuts down, the amp likely has blown output transistors.

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2 Answers

Amp in protection mode


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1 Answer

Doesn't turn on


Measure the DC voltage across the B+ and ground terminals as well as across remote and ground. If you have less than 11 volts when the amp tries to power up, the amp could be shutting down due to low voltage. If the voltage remains near or above 12v, disconnect all speaker wires and signal cables from the amp. If it powers up, the wiring needs to be checked. If it still shuts down, the amp likely has blown output transistors.

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1 Answer

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