Question about Alpine MRP-M450 Car Audio Amplifier

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Power turns on briefly

It's not a wide setup, amp is going to 2 woofers like it did in my previous vehicle.

HU powers up w/car, amps power light briefly turns on and then back off.

Not sure whats up...

Tested power - 12v
The light turns on which kind of tells me its getting signal from the HU, ie remote wire.

Suggestion?

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  • 15,935 Answers

Sounds like a protection problem. A relay may be stuck, or there really may be an internal problem you cannot see. Take it to a shop to have it bench tested independent of your vehicle.

Posted on Dec 22, 2008

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If you have power, and the amp has previously worked.
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Make sure your head unit is off.

Reset the amplifier using the manufacturers specified method. Usually this is just power down briefly and then back up. I usually pull the amp fuse and make sure all LED's on the amp go out. Wait 10 seconds, and then put the fuse back in.

If the LED comes back on when you reconnect power, without the HU being on, you've got a bad amp.

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Check the ohm of your soeakers again. If it doesn't say 2 ohm thats the prob. Keep in mind that 2 ohm can be any where from 1.7 too 2.3 but any reading on you DVOM that gives you two decimal places is also wrong. i.e. 2.17. This would mean that you have a woofer shorted.

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