Question about Kenwood KAC-7201 Car Audio Amplifier

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Blowing fuse My amp turns on, but when I go to connect it, it blows the fuse. How can I determined the problem and can it be something that I can spot and fix on my own.

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  • mutiny71 Feb 05, 2009

    my amp is the kennwood KAC-7201 800W, 2 10 inch kickers. but I have to amps, one for the front speakers which is another kennwood amp also KAC-8401; any my speakers r fine not blown. I actually opened the amp up to check if i can spot anything.

  • Anonymous Mar 24, 2009

    CLose to the same problem except that I haven't connected the speakers to the amp yet, but everytime I change the two 30 amp fuses on the side and turn on the power the light on the amp comes on for about a second and then blows the fuses. Any ideas what could be causing this? The amp has worked fine for the last year and just started doing this about 3 weeks ago.

  • Mark Skinner May 11, 2010

    Hello, I repair amps for a living and get a lot of business thru If your fuses are blowing when you turn on your amp try unhooking the spaekers, I guarantee the fuses will still blow. Thats why there is a protect mode to sense these problems. If everything is hooked up properly than it's internal and is going to need repaired. Sounds like the power supply has shorted out somewhere. Probably some power supply mosfets. If it makes you feel better hook the subs up to the other amp to see if they work on that amp. Better yet get a volt meter and check the ohms of your speakers just to make sure. But I guarantee you your speakers are not the problem. If interested in getting it fixed I am the cheapest repair shop anywhere. I have a website but its under construction from my old one. I'm up dating everything. It's We are in the process of moving to a bigger facility with more bays to install more audio systems. I also own a business installing car audio/video systems. Let me know if ytou want it repaired. I can give you references from people wwho sent me amps from reading my posts on Good luck and please vote so I can get out of this apprintice status. I have 15 years of experience doing this .



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Most of the time, when you connect it and it blows a fuse, one of the speakers are blown or you have too high of a power demand than the amp can put out.

Can you put more detail in to your question so I can answer it more appropriately? What kind of speaker, what kind of sub, the wattages, etc.

Posted on Feb 05, 2009


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1 Answer

The 30 amp fuse keeps blowing

First, determine what devices the fuse is protecting. There should be something inside the cap of the fuse block to tell you. 30 amp probably goes to the headlights. Check for wiring that rubs against metal and may have rubbed off the insulation. Does the fuse blow when you turn the ignition on or does it blow later?

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Does the fuse blow when the wipers are off or when you turn the wipers on? A fuse blowing means either a short circuit or an overload. Lets say that your wiper transmission is new and working properly, then an overload is probably blowing the fuse which is caused by the circuit pulling to much current because something is not aligned correctly and moving freely when the wiper motor is turned on. Before you connect the arms to the transmission, move the arm assembly manually with your hand to make sure the wipers go across and back on the windshield. This will verify that the arm assembly is moving freely and not jamming. Then turn the wiper transmission without connecting the wiper arms and see if the transmission is working properly and not blowing the fuse. This will verify that your wiper transmission is not defective. Check the wiring going to the wiper transmission for any bare spots or nicks on the wire insulation. If you have a bare spot or nick that is touching metal, the fuse will blow (this is called a short circuit). If you find a bare spot or nick on the wire use electrician tape to insulate the bare spot or nick. Usually three wraps of electrician tape around the bare spotor nick will do the job. Oh, make sure to replace the fuse with the correct amp fuse. Your car dealer auto parts can provide the information (over the phone) on the correct amp size. You can purchase the fuse at any auto parts. FYI: Too small an amp on the fuse will blow when the wiper is turned on. Too large of a fuse will cause the wiring to burn if your wipers should stop shifting and jam. Good Luck. Hope this helps.

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It's probably not your outlet, but try to get it into another one so you are sure.
It could probably be that something is wired short, so the amp draws extra amperes, therefore blows fuses.

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I have a 97 galant that keeps blowing the 100 amp fuse? alternator tested good twice checked wiring reads good is there another fuse ?

Usually that fuse powers the alternator and the fuse box.
It would have to be a big short to ground to blow that fuse.
Its possible the main wire to the alternator is touching a metal spot, or the alternator is shorting out inside when it is running.
What is draining the battery may be something else, or the battery could be discharging after the fuse blows if the alternator is not charging it.

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Could be 100 things. Do you see any burnt components or burnt spots on the board? Probably no way for you to fix this unless you have the electronics repair skills unless you visually spot a short on the board like a loose screw that ended up laying on a couple of components etc.

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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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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 Audio & Video

1 Answer


Hi, when the fuses blow it can only mean that the current the passed thru it is greater than its rating. It is possible that the fuses installed has a lower rating than is required by your amp. To check look over the specs of your amp and determine the proper amperage (amp) rating. Specs may be found on a sticker at the bottom or side of the amp and may look something like 12V-20A meaning 12 volts 20 amperes. In the absence, you may want to check the box and/or the instructional manual that came with it ot go to the manufacturer's website to checkout the specs. If you are referring to the fuse serving all your amps, players, receivers, etc, then you have to addup all their individual A rating and get a fuse whose rating is equal to the addedup value. Although this is not a sound practice and individual fusing is preferable. If the amp rating is equal to the fuse rating but it still blows, then you may want to have your amp checked. Trying to install a higher rating will most likely prevent fuses blowing and present itself as a temporary solution but the real problem is not solved and may be aggravated. Hope this be of some help and good luck.

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