Question about Car Amplifiers

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Amp not working

My amp just stopped working it keeps blowing the 100 amp fuse in my main power wire every tome i turn it on, theleds blink faintly and the amp makes a cliking sound, so i opened it up and really checked it over i seen nothing to lead me to beleive that its blown,would you have any ideas?

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  • loren_nov May 07, 2008

    my amp is a punch 1000 2 channle thanks for taking the time to answer.

  • Anonymous Jun 26, 2008

    cs800 breker fuse 15a blows when power is turn on

  • Daper07 Feb 11, 2009

    my amp is a ppi pcx 5800 and it keeps blowing a 100 watt main power fuse . Every time i put a new fuse in it pops.

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  • Master
  • 631 Answers

If the fuse only blows after remote voltage is applied, it likely has shorted output transistors.

You should confirm that nothing external is causing this by disconnecting the speaker wires from the amplifier's speaker terminals and disconnecting the RCA cables from the jacks.

What make/model amp is this?

Posted on May 03, 2008

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1 Answer

My amp keeps blowing its fuses whenits plugged in


Go over all your wiring. Make sure your power wire isn't grounded somewhere. If your power wire is touching any bare metal it will spark and blow the fuse the second you touch the power to your amp. Make sure your in-line fuse is about a foot from your battery, and make sure you have your ground wire grounded securely to the main chassis of the car/truck and that it is either same size gauge as your power or even a little bit bigger gauge. Also make sure no strands of wire from your ground or power wire are loose and reaching over touching the other where you plug them into the amp. If the ground and power touch eachother they will blow the fuse and possibly cause permanent damage to the amp.

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First off which fuse is it? The inline fuse from the battery or the amplifiers power supply fuse? Blowing the main fuse from the battery is caused by either the load (your amp) drawing too much current or you have a short to ground somewhere. Maybe there is a tear in the 12Vdc line and it is shorting to the chassis of your car. If the amps power supply fuse is blowing as soon as it turns on your amp has a shorted power supply. This will require internal component changes by a technician. If it is blowing after operation at high volumes I would say change the impedance that the amp is driving. If you are at 2 ohm try to rewire your speakers for four ohm. (go from parallel to series wiring then bridge mono or operate the amp in stereo mode)

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1 Answer

I have a 25 wat fuse in my power wire connected to my amp and i keep blowing it. should i put a bigger fuse in it?


Hello grabert205,

You do not say if the fuse blows immediately upon powering up or while the amplifier is operating. If it blows immediately, I'd check the power and ground.

If it is blowing the fuse while operating, I'd try a 30A and see if it holds. At maximum output of 100 watts times 4, the amplifier needs about 31 amps of current at 12.8V. So driving it hard could certainly blow a 25A fuse.

Hope this helps.

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Make sure that the speaker wires are wired correct at both the amp and the speakers......otherwise it sounds like the typical death of a power acoustik amp (great amps, but prone to a premature death)

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The reason your blowing fuses is the amp needs at the least a 150 amp fuse on the wire that runs to your bat. There are fuse blocks that you can put 4 40amp fuse and theres the high dollor ones that you can put all the way to 200amp. When you trun up your amp its drawing to much current for the little 40 amp fuse that you have and will blow it everytime. I recomend Running a 4 gage wire to bat and ground with same. Get you a 150 or above amp fuse from a car audio shop somewhere. anyway sounds like from what you decribed, theres nothing wrong with your amp just the wires and fuse are not big enouf to handle the current that your amp pulls.

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Since it's an intermittant problem and a relatively expensive amplifier, you should have it checked by a qualified tech. If you keep trying to power it up, it will eventually blow out the power supply transistors which will add as much as $100 to the repair bill.

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the amp draw rating on the amp is 100 you need to put a larger fuse in, such as a 150 amp, it would be a good idea to go to 0 ga but not needed. you might also want to upgrade your altenator.

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