Question about Alpine MRP-F300 Car Audio Amplifier

Open Question

Alpine mrp-f300 won't stay turned on

I bought the amp about 5 months ago. It worked flawlessly up until the other day when it just cut off. I looked at the amp and the ground wire had come loose. I reattached it and now the amp's power light will turn on when the head unit is turned on, but then the power light just fades off shortly after. When I checked the voltage between the battery terminal and ground wire terminal on the amp, the reading was less than 1 volt and continued to slowly decrease. However, when the power wire was removed from the amp and I checked the voltage between the power wire and the ground terminal on the amp, it read the full voltage of the battery. I checked both of the 25A fuses on the amplifier itself for continuity using a DMM and they both passed. I also checked the voltage on the fuse that is located on the amp's power cable. The reading was the full voltage of the battery. I even disconnected all cables and tightened up all of the connections to be sure there were no stray strands of wire causing a short. There was no smoke or funny smell or even heat from the amplifier. I didn't even hear any "popping noise" from it. Does anyone have any idea what this could be?

Posted by on

  • 2 more comments 
  • futrofmx09
    futrofmx09 Nov 26, 2012

    I was worried it might be fried as well, but even after these symptoms came up, I played around with a few wires and it began to work again for a short time. Now it's back to these symptoms. Also, overheating the amp was something I was careful to keep a close eye on. Every time I finished using it, I laid my hand on it to be sure it wasn't getting too hot. It was never even warm.

  • futrofmx09
    futrofmx09 Nov 26, 2012

    The fact that the amplifier worked again after these symptoms occurred leads me to believe that there is a faulty connection or a short somewhere in the amp.

  • futrofmx09
    futrofmx09 Nov 26, 2012

    Thanks for your help!

  • futrofmx09
    futrofmx09 Dec 09, 2012

    Finally figured it out for anyone reading this post. Seems the in-line fuse to the battery was slowly failing. It wasn't noticeably bad at first, but it must have been flawed. Bench tested the amp myself and found out the fuse was bad even though the blade itself was not severed. A quick replacing of the fuse and it's working perfectly once more!

×

Ad

5 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE:

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Ad
  • 631 Answers

SOURCE: Wiring diagram for Alpine MRP-F300

From the Crutchfield site:

Owner's manual

You'll use fig.8 for the front speakers and fig.9 for the subs.

Posted on Sep 05, 2008

Ad
UpfrontAudio
  • 47 Answers

SOURCE: alpine amplifiers fade in and out durring high volume bass hits

main problem i think you are having is your loosing power when it kicks a note.. get a power cap! power caps feed your amps constant power! this will solve your problem :)

Posted on Apr 20, 2009

84chevypu
  • 2 Answers

SOURCE: Equipment not turning on!???

Have you tried checking the remote wire yet? Because it could very possibly be that. Without a remote wire hooked up, you cannot get any power. Try that and see if it works.

Posted on Apr 29, 2009

  • 133 Answers

SOURCE: Alpine mrp-m450 Amp won't stay on

Sounds to me like it might be the remote turn on because the first time i installed it, it did the same thing, and i found out that there is two blue wires coming out the stereo, one with a white stripe, i connected it to the blue wire, and it didnt work, then i connected it to the blue and white wire, and it worked. Well hope this solves your problem, goodluck.

Posted on Jul 06, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Blue light always on is this normal


Thats the power indicator for all alpine amps. Do you mean it stays on with the radio off????

Mar 04, 2012 | Alpine MRP-F300 Car Audio Amplifier

1 Answer

Power to amp no sound


Test your subs on another amp....If they are fine then try running different rcas in your car from the stereo to see if they are the culprit. If still no sound probably your output on your amp is gone.

Mar 04, 2012 | Alpine MRP-F300 Car Audio Amplifier

1 Answer

I just got the MRP-F300 amp installed today and the rear-left speaker completely stopped working shortly after the installed. There is no cracking, hissing, or any noise whatsoever coming from that...


not usualy if you were running them before without the amp the speaker could have still easily blown. with just the deck running the speakers you can clip the sound and damage the coils hook up and amp then you force the power through an already damaged speaker finishing it off try another speaker. or if it was bought used amp may be no good the previous owner probably noticed it cutting in and out and sold it before it fried. or the deck is old and yes it is a possibility the radio went bad. if you used cheap rca cables yes it could be bad as well.

Apr 08, 2010 | Alpine MRP-F300 Car Audio Amplifier

1 Answer

Equipment not turning on!???


Have you tried checking the remote wire yet? Because it could very possibly be that. Without a remote wire hooked up, you cannot get any power. Try that and see if it works.

Apr 29, 2009 | Alpine MRP-M500 Car Audio Amplifier

1 Answer

No light on Alpine MRP-M1000


Ok. Have you check the Ground and the Power connection.

Jan 25, 2009 | Alpine MRP-M1000 Car Audio Amplifier

1 Answer

Alpine mrp-f300 cuts sound off when volume is turned up.


the problem when someone become a car audio fanatic is, we want to hear BOOMS but we are not sure how many watts the amplifier can handle, besides that theres one very important thing that most of the installers don't know. its called ohms law (not a joke) that law tells you everything about how to measure the ohms marked on the speaker labels and also the way that you connect the speakers (theres two models; serial circuit and parallel circuit)

every single movement that you make on the connections tells a different story, and if you over load the amp it will auto protect.

i suggest you to set the level at least at 60% so you don't make any damage to the internal components, and don't forget to study ohm's law because a really professional installer knows it and well, they do the matt to get the best performance.

Dec 11, 2008 | Alpine MRP-F300 Car Audio Amplifier

1 Answer

Wiring diagram for Alpine MRP-F300


From the Crutchfield site:

Owner's manual

You'll use fig.8 for the front speakers and fig.9 for the subs.

Sep 03, 2008 | Alpine MRP-F300 Car Audio Amplifier

Not finding what you are looking for?
Alpine MRP-F300 Car Audio Amplifier Logo

118 people viewed this question

Ask a Question

Usually answered in minutes!

Top Alpine Car Audio & Video Experts

xxxxxx xxx

Level 3 Expert

5013 Answers

Robert Salgado
Robert Salgado

Level 2 Expert

200 Answers

Jaime Hernandez

Level 3 Expert

2337 Answers

Are you an Alpine Car Audio and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...