Question about Kenwood KAC-729S Car Audio Amplifier

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HOW TO FIX A BLOWN CHANNEL?

Every time i hook my amp up it keeps blowing my fuses. It only happens when I hook the power wire up. I know its a blown channel so if there's any one that can help please do so thank you.

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The power supply appears fried and possibly one or more of your output channels. Unless you are good at repairing this sort of thing then I would suggest you save your self a lot of hair getting pulled out in frustation and go to a repair guy and let him pull his hair out instead. Good luck.

Posted on Apr 22, 2008

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I'm running 8 gauge wire for battery cable and ground cable....my amp.is a momentum 600 watt...2 channel. ....my fuse is blowing every time I hook up either cable...


First of all, what size fuse? Check the amp and see what max amperage is, and insure your fuse is that size. Secondly, I suspect either a blown speaker or blown outputs. Disconnect the speakers from the amp and see if the fuse still blows. If it does, either you are hooking two wires up improperly, or your outputs are toast.

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Remove all the wires from the amp including the remote turn on wire. Once you do that, after about 30 seconds the amp will reset. Hook the power up first, then the ground then the remote. Turn the unit on and check for power WITHOUT the speakers hooked up. If you get no power by now it's a good chance that the amp is cooked. If you do get power, try hoking up your speakers first on one channel then the other channel and then bridged. If it cuts out or off when you touch the speaker wires to one channel or the other, then that channel is no good. Hope this helps.

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How do you fix a blown fuse circuit in a lt1440 power acoustik amp


Just replace the blown fuse with one of the same amp rating... If the fuse keeps blowing you'll wanna recheck your wiring and make sure you don't have a short somewhere.

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you need to go tho a block fuse which will be able to handle more load but will still give way before the amp its self would get fried i recommend a 75 fuse or higher

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Disconnect all speaker connections and rca cables. Leave power, ground and remote wires intact. Try turning on again. If you still have a protection light your amp is faulty. Hopefully you have warranty. Might be time to rep .A thumbs up would be greatly appreciated if this answer is helpful to you. blown-channel-zb4bomd1rt4qms0dqd12kkt2-3-0.jpg

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Gee I would think that it is kind of obvious; your amp is blown. Just because it doesn't blow fuses doesn't mean much. If you hook the power up to the ground input and the ground to the power and then turn it on you pretty much toasted the amplifier. If you don't know why the amp is smoking, but you're trying to fix it yourself, you are basically telling me that you have no business doing so. I have been an installer for 15 years and even I am not dumb enough to try to fix a bad amplifier. Do everyone a REALLY big favor; stop messing around with something that you don't understand of have knowledge about before you hurt yourself.

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If it keeps blowing fuses then #1 its internally damaged or "blown" .. Or #2 i would make sure you have the battery power hooked up to the + terminal and the ground wire running from the car body to the - terminal.. so if its hooked up correctly and keeps blowing fuses then it requires repair.. I wish i had better news but thats all it can be...

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Is the equiptment used? Your subs may be blown, try disconnecting them from the amp, then power it up, and then see if it still blows fuses. If it does, your subs are either wired incorrectly, or blown.

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1 Answer

Blown fuses


I used to have one of those amps also (nice amp btw) Did you try another fuse of the same size?
Is it blowing fuses everytime you put one in or did it just blow that one fuse ?
Is the conection on the battery solid and clean of corrosion build up? Because that is a good amp and if wired properly shouldnt blow out or anything and so if the speaker is not blown then maybe connection is weak somewhere? I would try disconnecting the speakers from it and try a new fuse and if it does not blow the new fuse than amp is ok? and if it does blow the new fuse right away then there must be a short somewhere in the wire or the amp. then disconnect the fuse again and reconnect the speakers and if the fuse blows with the speakers connected but doesnt blow with them disconnected then you know it is a blown speaker causing the problem.

Just currious but what size fuse do you have connected at the battery?

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