Question about Car Amplifiers

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Hi i am matt

On my amp the red protect light stays on and it wont let my amp work and when you take out the fuses the red light goes off

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  • mmcvay911 Nov 08, 2008

    I just installed 2 older alpine amps in my truck. After trying to fire up my system for the first time, the power lights on the amps both are red. I have checked all my connections but cant get the lights to go green. They stay red whether the rca cords are plugged in or not

  • pickle_lord May 21, 2009

    my protection light also comes on, but it only happens when i have the Volume higher and no sound will come out at all.... as soon as i turn the volume to a lower level the sound comes back and the Red Protect light goes off. Seems like there is a short, but how can the short only come when the volume is higher... is it maybe that my battery just doesn't have enough juice?

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If the protection LED lights only after the remote voltage is applied (head unit is switched on), the amplifier likely has shorted output transistors. If the protection LED remains lit without remote voltage applied, the amp may have other problems.

Does the protection LED light with no speaker wires connected to the amp and no RCAs plugged into the amp?

Posted on Jun 23, 2008

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The red light you describe on your amp, is the protection mode warning light. An amp goes into protect for many reasons. Here's a checklist.

1st check the fuse (s) on your amp and make sure they are not blown.

2nd check the inline fuse next to your car battery (if you have an inline fuse)

3rd, disconnect the speaker wires with amp on, does the light go off?

4th check your ground, this may be ok if you have tried another amp with the same wires.

5th.if none of these turns the protect mode off, it may be an internal fault.

you may have blown transistors and it is a tricky job to repair and costly.

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Disconnect the subs. and turn on.
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