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Car amp

My name is fred .i have a red protect light on, and sound on speakers come on and off,,,,any suggestion will help,,,thanks

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If the amp is in protect mode, it probably has shorted output transistors. To eliminate other possible problems, do the following.

With your multimeter set to DC volts, the black meter lead 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 lead 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 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 almost certainly has shorted output transistors and will need to be repaired.

Posted on Sep 15, 2008

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red light is usually bad like protection mode unless it is supposed to be red. amps are always green and red is protection indicator normally. look it up for your amp and if you bought it used you got ripped off

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The fault is on the amp! It sounds like the protection circuit is detecting a surge on the channel and shuts it down to protect the speaker. I would check the semiconductor device(s) for the right channel on the heatsink of the amp. You might even see damage of burning on one!

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there are 2 reasons for it to be going into protect mode 1 is heat 2 is the load on it. if it is going into protect mode soon after it starts there is a problem with the speaker. if it is after it has been on for a while it is that the amp itself is overheating. hope this answers your question

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The protection light comes on if the amp overheats or if the speaker outputs are shorted.

Turn everything off and check all of your speaker wires for shorts. When you locate and repair the short, the protection light should go out and your amp will work normally again.

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Where can i get a free copy of schematic diagram for amplifier


Generally a "protect" mode would be triggered by a shorted output (speaker). I would suggest disconnection all of the speakers to see if the red light goes off.

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It probably has shorted output transistors. To eliminate other possible causes, read through the following page.

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Let me know if you have any other questions.

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I would suggest first to unplug it completely and plug only the power,ground, and remote and see if you get your beloved green light again.

If this indeed gives you the green light, it means that the amp is protecting itself from a short circuit caused by the speakers, check the speaker cables or the speakers themselves..

if this remains the same, it'll be internally in the amp's circuitry.. unfortunately, it'll be dificult to tell you exactly what failed in it.

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If the speaker wires touched and the protection circuit didn't engage quickly enough, the output transistors may have failed. This is the most common cause for an amplifier to go into protect mode.

If you disconnect the speaker wires from the amp and the B+ and remote voltage are above ~11 volts (place black meter lead on ground terminal of the amp when checking the voltage), and the protect light still comes on, the amplifier will need to be repaired.

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