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Amp problem my amp blows fuses. i have checked the wiring up and down and cant find any shorts. but about 2 weeks ago (when this began) my cd player was not working so i had to press the RESET button to get it back online. i havent changed any settings or components save a new car battery, but i got that after i started having problems. when i put a new fuse in and turn the key, the amp power light comes on red, turns green, and then POP! blown fuse.

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Re: amp problem

I had the same problem i took the amp apart and found a screw that had worked its way loose i took it out and now the amp works properly i think it was just jammed in some kind of power source. just give it a look and see hope this helps..

Posted on Feb 23, 2009

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Re: amp problem

Are you handy with a volt meter, I would first check for shorts, what amperage fuse are you using? Do you know what amperage is reccomended for it? manual?

Posted on Dec 06, 2007

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Kenwood KAC-729S keeps blowing fuses. Checked all cables, re-ran power, remote, and ground. All good, still blows them at power-up.

Hello opey_69a,

Here are the troubleshooting steps for fuses blowing.
1) Remove all wiring except ground, power and remote and see if the amp powers up without blowing the fuses. If it does, the problem is in the input cables or speaker wiring.
2) The use of loudspeaker impedances below the recommended minimums will cause the amp to draw excessive current - check.
3) A shorted or grounded RCA cable may cause the fuses to blow - check.
4) If an amplifier fuse blows continually, with only +12 volt, ground and remote leads connected, the amplifier is probably defective, most likely shorted output MOSFET's. In this case the amp needs professional repair or replacement.

Hope this helps.

Sep 19, 2009 | Kenwood KAC-729S Car Audio Amplifier

1 Answer

I have a dual XIA3145 580 watt amp that keeps blowing fuses

Generally, this indicates that there's at least one shorted output transistor.

Disconnect all speaker wires from the 'amplifier's speaker terminals' and disconnect RCA/signal cables from the amp. If it powers up normally, the speakers/wiring need to be checked. If it still blows the fuses, the amp almost certainly has shorted output transistors and will need to be repaired.

I'd recommend using two 10 amp fuses. The amp will power up with 10 amp fuses if there is no problem. If there is a problem, there's less of a chance of doing more damage by using the 10 amp fuses.

Let me know if you have any other questions.

Sep 04, 2009 | Dual Electronics illumiNITE XIA3145 Car...

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Amp fuses blowing and amp overheat

Does the amp heat up if you power it up with no speaker wires connected to the amplifier's speaker terminals?

Jul 17, 2009 | Rockford Fosgate Punch P5002 Car Audio...

1 Answer

Fuses blowing

It may not be your amp at all, disconnect the power wire from the amp and then try a new fuse. If it still blows you have the power wire grounding out somewhere, if it doesn't then it would have to be the amp.

Apr 01, 2009 | Diamond Audio D5-600.1 Car Audio Amplifier

2 Answers

My amp wont turn on

The reason it used to cut-off at 60% volume as you said before,
Is probably due to the "protection circuit mode" being tripped.

You can try resetting it by turning off your CD player ,removing the Batt( + ) and Gnd ( - ) terminals from the amp for a short period. Reconnect them Allow the amp to receive power but not switch on (keep cd player/remote power source off)

If you dont know how to wire the CD player to control the amps power status , the easiest way is to connect the 'power antenna' or similar low voltage throughput wire from the head-unit to the amp's Remote terminal.

My old amp did the same thing ,and would need to be powered off/on before resuming sound output, sometimes I had lots of trouble with the protect mode staying on , even with little or no sound output from headunit.

Jul 14, 2008 | Kenwood KAC-9152D Car Audio Amplifier

1 Answer

Jensen Amp and Sub

If you followed the instructions correctly, then the amp must be defective. This is sort of simple.

My generic suggestions:
You have the power, the ground, the outputs to the speakers, and then the input.

Make sure that none of the speaker wires are somehow being grounded. Make sure that nothing is shorted that feeds the speakers.

Jerry G.

Apr 27, 2008 | Jensen A300HLX Car Audio Amplifier

1 Answer

Factory radio keeps blowing fuses.

you should bypass the factory cd player. I installed a panasonic cd player in a 1994 gs 300 and it was hell. there are alot of wires that have nothing to do with the radio i believe one or some of those wires may be whats causing your problem try this solution if that doesnt work you may have a serious electrical problem

Mar 26, 2008 | Car Amplifiers

1 Answer

Amp blowing fuses

The amplifier probably has shorted output transistors.

Disconnect the speakers and RCA cables. Replace the fuses with two 10 amp fuses or a single 20 amp fuse. If the amp blows the fuse when it powers up, the outputs are almost certainly the problem. Don't try it with the two 30 amp fuses. The smaller fuses will provide more protection for the power supply. If the amp powers up with the smaller fuses and they don't blow, check the speakers and the wiring (for shorts to ground or shorts between wires).

Nov 22, 2007 | Rockford Fosgate p-450.4 Car Audio...

2 Answers

Kenwood 7202 Amp that is blowing fuses

If your speakers are wired for an impedance below 4 ohms mono or 2 ohms stereo, that would make it shut off. If you have a speaker wire shorted to ground, it would also cause the amp to go into protection.


If the speakers are not the problem, it may be shutting down because the voltage at the amp is dropping too low.


Oct 19, 2007 | Kenwood KAC-7202 Car Audio Amplifier

1 Answer

Hok up amp and all fuses blow on distribution block

somehow, DC car voltage has gotten to the speaker outputs of your amp! your fuses are saving your speakers from meltdown. your amp has melted down. toss it after checking with ohmeter as follows: disconnect amp completely. red wire from ohmmeter to +12Vin. black wire to SPK+. if ohms are anything below 1000 ohms, then toss it. An electrical short is equivalent to flooding your entire house with a leaky faucet. No telling what that rapid current will encounter along the amplifier section. you could get lucky and find all power MOSFETS have shorted and replace them. good luck.

May 31, 2007 | Jl Audio 500/1 Car Audio Amplifier

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