Question about Kenwood KAC-9102D Car Audio Amplifier

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Amp runs with no ground

I just bought a new kenwood momoblock class D if that helps,so i hooked up the amp and and it turns on with no ground,i have it fastened to my truck with screws so thats where its getting its ground, but i thought that they were ground protected just wondering if theres a a circit problem ,also the amp cuts in and out once it gets hot i have 4 gauge wire and a cap and it still kills my headlights please help.

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Here's some good info so you will be knocking the spl trophy over. 1 you can go to the car audio shop and drop a fortune or try this which is guaranteed to work.
First get 2 gauge wire then get a super strong battery for under your hood and then by the same super power battery to put back by the amp. I'm an electrician and a bass junkie even longer. So I know this works. Go to you local welding supply store and ask for 2 gauge wire long enough for your vehicle plus 10 feet extra. It is the exact same wire as the wire in car audio shops but higher quality, Its called polyflexoprine. Just doesn't have the colors on it and you will save a lot of money, not to mention this wire has better shielding and more strands per inch, which is good. That should be 40$ Versus hundreds at stereo shop. Next buy two red top batteries. Third replace your battery ground under you hood with 2 gauge ground wire under 9 inches. and put a battery connector for negative side and a copper end fitting from AutoZone on the other end and bolt to chassis remove the original factory ground from under the hood or hook both up at same time doesn't matter. This trick will boost you amp circuit because that's where the circuit ends and most people don't do that . Just doing that can make a huge difference alone in most cases. Next get a 250 amp anl battery fuse along with a one wire in and two wire out rear anl fuse holder for 250 amp distribution for power near your amp at the same time. Get that amp off the wall of the cab you have it mounted on and build an amp rack. Do not mount on box or anything else that vibrates severely. Run your 2 gauge wire ( which can be hard, best to take entire carpet out and you will find pathways to go through and you will never know its there. By the way its Pretty big.) and make you way to the area where you want to locate you amp. ( hint sit amp in car so it sit straight up and you know which wire goes on each side. Biggest mistake made is running rca wires beside power wire. They have to be on opposite sides of the car and know you don't need the expensive one if you follow this golden rule. Before Any further go to the back and find an area that you can nut and bolt a ground down to the vehicle, take a grinder and grind all paint and primer off. Yes its that sensitive,. Place a nut and bolt in best place and try to keep ground well under 13 inches. same for under hood. And fuse under hood needs to be under 9 inches so it cat reweld and fry you amp.
Know that that is done skinning your wire to fit both front and back anl fuse holders. Caution Place rear 250 amp anl before you hook the 2 gauge wire on the the positive terminal wire before you run the power out to the positive terminal. ( fuse before battery or yopu wont get maximum voltage at amp.) of the second battery for you amp in the back. ( This amp is her to serve as a bank of power to be there when the amp unloads. Yes this works. Its easy to built a battery box out of speaker box and paint it and know on will see it and it wont be obvious. (Buy your accessories for this on amazon they have the best to choose from and high quality. Next This is your choice on how you want to ground the rear battery preferably red top. I grounded mine with nut and bot separately. ( You can buy a ground block where you run one wire to chassis as described and has multiple slots on other end, but I recommend again grinding and nut and bolting in different chassis spot to prevent ground looping.
Now with you amp being the big bad boy trim down you 2 gauge or come of the positive rear battery terminal with 4 gauge and run it to the power position on amp. Hook up remote, subs. And for the best performance ground your amp separately and all grounds before and you will get the best results, 4 gauge will be ok . I used the 2 gauge cause my JL 1000 accepted it. If your wont you can use 2 gauge and trim it down and put a connector on it maye...... The only reason you want to stick with 2 gauge is when you put your power meter to you amp to see how many volts are going to the amp and I know your amp will almost double wattage and output if you can get 16 volt or higher than you have an amp at half price cause she doubling what was advertised when you bought it. And I know cause I had one of the 2004 JL1000 and it did the same with the JL 375 x 4 mid amp. And I took every spl contest . hey its about the prettiest install, nicest stuff and I felt like sharing on how to double you power. Amazon has best deals on high end Anl fuse holders for high voltage. And Red Top Batteries will outlast cars I've done it. Good luck boys hope yall have fun and you get this beast of an amp not grounded installed like a pro. I just told ya how.....I'm out Eastwood

Posted on Apr 03, 2014

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Try running a ground cable to the batt

Posted on Nov 10, 2007

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Ok... well seeing as you're using a 919RMS amplifier D class i'm sure you are having some power drainage problems.. there are a few easy ways to fix this. Look into buying a high output alternator for your car... and also look into have another full battery running for your system.. screw caps they are a waste of money and time.. just buy a battery. Also you should probably be using 0" gauge wiring for your ground and power source... when i had the same amp hooked up i had 0 gauge wiring for power and ground. and for my speaker wire i used 4 gauge... you are using 4 gauge as your power wire? .. also.. what kind of car do you have?

Posted on Dec 07, 2006

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Also if you headlights dim, it is an indication the amp is trying to draw more current than is available. you might have an altinator problem, or may need a bigger one.

Posted on Oct 31, 2006

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One thing is take the screws out that you have used to mount it. Obviously you have drilled into bare metal. The path that you have created for the ground was not designed for that kind of current which would explain some of the heat. It warns against doing that in the manual. I have this amp myself and it heats up and cuts out all of the time still. I do not believe it is a power problem. I have a 5 Farad cap. Make sure your main ground for your car has a big enough gauge wire and also, if you can afford it, buy better battery terminals.

Posted on Oct 31, 2006

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What u think


Hello jayPRICAN,

You do not say what kind of speakers you are running on the amp and that can affect how you troubleshoot the problem.

Most often, a wiring problem such as a faulty ground or short in the speaker wires will cause such a problem. Here are the most likely causes for the amp to go into protection.

1) When a speaker wire is shorted or grounded.
2) Overheated.
3) When a ground wire of the receiver/head unit or the amp itself is not properly grounded.
4) When the amp itself malfunctions and a DC is sent to the speaker output.

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