Question about Kenwood KAC-9152D Car Audio Amplifier

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Heavy-duty alternator or not??

I havent been able to get my system going, it wasnt getting enough was getting 12 volts with the the power wire by itself, but once i hooked it up to my amp, it went down to 3.5 volts (if anybody could tell me why that is happening that would be great!!!!!!!!!) but i just put a car battery in the trunk, and it solved my voltage problem, but im wondering if i will now need a heavy-duty alternator......thanks in advance

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Hello howdoiuhhhh,

There's a serious voltage drop somewhere in the wiring. If the voltage went up when you installed a 2nd battery closer to your amp, I would suspect that the power and/or the ground is either not getting a good solid connection or is too small a gauge for it's length, or both. I'd try to find the problem before installing additional batteries or a heavy-duty alternator.

The only time a second battery is useful is if the audio system is to be used with the car off. And then it should be installed with an isolator to keep it from the rest of your car's electrical system.

After you have made sure that your wiring supports the amp and only if your total audio system power is 1200 watts RMS or more, you may need to:
1. Upgrade to a high output alternator
2. Upgrade to a heavy duty deep-cycle battery
3. Upgrade the "Big 3" - that is to replace (or add to) the power wire between the battery and alternator, the ground from the battery to the chassis and the ground strap from the
engine/transmission to the chassis with at least 2 AWG wire and preferbly 1/0.

Hope this helps.

Posted on Apr 17, 2009


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12 volts but you have to do the following in order to run your amplifier with out any problem
Upgrade the alternator to a high output alternator.
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