Question about Kenwood KAC-7251 Car Audio Amplifier

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My kenwood kac-7251 car amp

When i turn on my car stereo and my amp comes on, it blows my fuses,the on under the hood & the ones on the amp.

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My first adivse is to check to make sure there are no power to ground shorts or any shorts for that matter. Then, a possibility would be if you have too small of fuses. Make sure you put the correct fuses in in amp according to the manufacturer's specs and the fuse under the hood should be size of your fuses on your amp added up plus a little extra. Meaning if you have 2 25A fuses on your amp then you probably want around a 60A. What ever you do don't put bigger fuses in the amp than the manufacturer specifies or you will cause damage if something gets shorted. Another possibility is that you could have the speaker impedence too low and the amp isn't stable at the impedence you have it at. I hope I could help. Let me know if you need me to specify more. Good luck
-Andrew Hawkins

Posted on Aug 27, 2008

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My kenwood KAC-7204--- the wiring is hooked up right, I just got a 2000 watt max sub 1000 watt rms, i was running the amp in bridge mode and it ran for 1 day than it turned off. I checked it and the fuse...


when i was running my sub off bridge mode this kept happening to me. I ended up just running two subs and for some reason the fuse stopped blowing. i think there is something wrong with these amps.

Jun 04, 2011 | Kenwood KAC-7204 Car Audio Amplifier

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why are you in stereo for subs? mono all the way.

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double check your remote wire or the ground. make sure you have atleast 9vs to the remote.

May 07, 2009 | Kenwood KAC-7251 Car Audio Amplifier

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Need help


If the fuses only blow after remote turn-on voltage is applied to the amplifier, the amp probably has shorted output transistors. If that's the case, they will need to be replaced.

If you're interested in repairing it yourself, read through the following page.

Amplifier Repair Primer

Let me know if you have any other questions.

Aug 26, 2008 | Kenwood KAC-7251 Car Audio Amplifier

1 Answer

Keep Blowing Fuses


Sounds like the amp is shorting somehow. You are obviously shorting out somewhere between the battery and the amp. Are you sure you grounding location is a good one? is the fuse blowing only when you turn the stereo on? Something is not hooked up correctly.

If the fuse at the battery is blowing then it's a short.

If the fuse on the amp is blowing then its probably a bad amp.

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Stuck in protection mode


First disconnect the subwoofer wires from the amp, turn the car off and back on...is the amp on? If so your subs are shorting it out, either from a frayed wire, or blown subs.
If it is still in protection mode, check the fuses in the side of the amp.

Mar 21, 2008 | Kenwood KAC-7251 Car Audio Amplifier

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I turn on the amp then the fuse blows??


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

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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.

 

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