Question about Alpine MRP-M350 Car Audio Amplifier

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Amp gets power but doesnt send anything through speaker wire

The bolt that hooks the ground wire into the battery is stripped it could be intermitting power to the amp but the amp is still getting power just not sending any and none of the fuses are blown should i try a new battery

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There are several things that could cause this that i know of, bad ground not being one of them.
A bad ground terminal should cause a noticeable distortion in sound and cause the amplifier to turn on and off.
If you are getting power and no sound, the first and easiest thing i would check is your RCA wires. Replace them with known good wires.
If that does not work, are you positive the speakers you have hooked up to your amplifier are not blown?
If available, use a DVOM to check resistances on the coils on your speakers. An open lead reading indicates a blown voice coil.
Also make sure that your speakers are each hooked up to a positive and negative terminal, as some amplifiers have two positives next to each other and two negatives, while others go + - + -.
Your amplifier could also have bad input or outputs, but i would try these other easy fixes before resorting to buying a replacement amplifier.
The only other cause to my knowledge would be bad RCA outputs on your head unit.
If possible try with a head unit you know the outputs work on.

Hopefully one of these suggestions solves your problem.


Posted on Dec 17, 2008

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    Gather the following tools: Screwdrivers, wire cutters, wire strippers, pliers, a utility knife, sandpaper, masking tape with a pen for labeling, 2 crimp-on o-ring ends for the power and ground cables. If you're hooking the amp to your speakers, you'll also need 2 crimp-on female spade connectors for each speaker.

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