Question about Alpine MRP-M350 Car Audio Amplifier

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Fuse on amp keeps blowing

The fuse on the side of the amp blows after replacing with a new one after about ten seconds of properly working. there are no shorts in any of the wires.

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Re: Fuse on amp keeps blowing

Something fried inside. Possibly an output transistor or MOSFET.

Posted on Jan 21, 2007

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I just replaced an amp and now the inline fuse by the battery keeps blowing

Most likely you have your power and ground connections reversed on the amp. That will cause the fuse to blow immediately upon contacting the two sides of the fuse. If the fuse stays intact for a short while but pops after turning the amp/car on and your connections are correct then there's a problem with the amplifier and it either needs to be serviced or replaced.

Dec 01, 2010 | PPI PC2600 Car Audio Amplifier

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So i hooked up the amp useing the pre-existing 8 gauge wire with a 30 amp fuse it worked for about and hour and started blowing the 30 amp line fuse. i replaced the line from 8 to 4 gauge and installed an...

this sound like a case of arcing power wire it happens very very easy if u use cheap wire especially from walmart. whatever u do keep using fuses and get a batt test asap. if u take out the fuses ull burn the amp like no other and plobably burn out the power rails which will be cheaper to buy a new amp after that

Oct 05, 2010 | Lanzar VIBE266 Car Audio Amplifier

1 Answer


Sounds to me like one of your positive cables keeps hitting metal somehow and causeing the fuse to blow. Ive had it happen to me when i had one of those amp splitter boxes that i didnt have mounted down properly and it slid into the metal on a seat post and same thing happened.

Apr 26, 2010 | Pioneer Car Amplifier GM-7100M - Mono Bass...

1 Answer

Fuse Keeps Blowing

disconnect rca and speaker wires if they still blow you may have a problem with amp

Jan 17, 2010 | Volfenhag ZX-8400 Car Audio Amplifier

1 Answer

Fuse keeps blowing

The amplifier probably has shorted output transistors. If the amp only blows the fuse after remote voltage is applied, the damage may be minor. They generally blow two transistors. Sometimes that's all that needs to be replaced.

Let me know if you have any other questions.

Aug 29, 2008 | Jl Audio 500/1 Car Audio Amplifier

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No sound

good day, check your spkr impedance, if 4oms use a posive spkr dividing network. if stills blows up replace a higher amperage of your fuse. ex.4A raise it up to 5A. the your amps consume higier current if more spkr wattage.

May 29, 2008 | Kenwood KAC-5203 Car Audio Amplifier

1 Answer


If the amp blows a fuse with no remote voltage applied, the amp has a short in the primary side of the power supply. If the fuse only blows after remote voltage is applied, the amp probably has shorted output transistors.

May 02, 2008 | Boss Riot 1500D Car Audio Amplifier

2 Answers

Blowing fuses

Here are some answers:

1. Make sure your amp does not have a higher amp rating then the fuse, For example, an 18 amp amplifier will blow an 15 amp fuse, so connect it to a 20 amp fuse

2. you have a connection issue, where something is shorting out

3. you are pushing the amp or car to it's limit with how loud you put it, and thus blowing it, fixed by getting a more powerful amp and a better fuse.

4. or there is something very wrong and cannot help you and you would have to bring it into a shop.

Nov 18, 2007 | Car Amplifiers

1 Answer

Car Amp keeps blowing fuses

The reason why fuses blow is that the current is too much. Is the fuse rating according to the specs ? If yes then ... One or more output power transistor (or audio power IC) may be shorted. have it checked before replacing another fuse as this might cause more damage.

May 22, 2007 | Profile CL1200 Car Audio Amplifier

1 Answer

Blown fuses

I used to have one of those amps also (nice amp btw) Did you try another fuse of the same size?
Is it blowing fuses everytime you put one in or did it just blow that one fuse ?
Is the conection on the battery solid and clean of corrosion build up? Because that is a good amp and if wired properly shouldnt blow out or anything and so if the speaker is not blown then maybe connection is weak somewhere? I would try disconnecting the speakers from it and try a new fuse and if it does not blow the new fuse than amp is ok? and if it does blow the new fuse right away then there must be a short somewhere in the wire or the amp. then disconnect the fuse again and reconnect the speakers and if the fuse blows with the speakers connected but doesnt blow with them disconnected then you know it is a blown speaker causing the problem.

Just currious but what size fuse do you have connected at the battery?

Jan 06, 2007 | Rockford Fosgate Punch P4004 Car Audio...

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