Question about Kenwood KAC-749S Car Audio Amplifier

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Car amp power problem

I have two car amps that do the same thing. the power light pulsates and i assume the power does too. what should i look for to be wrong with them?

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Re: Car amp power problem

Hi your assumption is wrong the light blinks for meny diffrent reasons: 1) power is too low - check the battery of the car 2) connections are wrong 3) the AMP is in safe mode here is the manual of the product: here is the home page: good luck

Posted on Mar 21, 2006

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Hi, I was trying to replace my subs and during the process, the positive wire touched the negative wire and my amp turned off. I have the Punch 801s 2400 watt amp. Is there a way to reset it? I'm assuming...

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. Your amp is clipping. A thumbs up would be greatly appreciated if this answer is helpful to you. GOD BLESS YOU.


Oct 17, 2013 | Rockford Fosgate Punch 801S Car Audio...

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My amps protect light is on and the sub wont work and it sounds like it is pulsating

it sounds like you have a short somewhere in your wiring, i would be checking the wires in this order 1)amp 2)rcas 3)back of sub
if after checking these you still havent found anything, one of your wires carrying a positive current has probably rubbed through to the metal on your car body.
so if you disconnect one set of wires at the amp at a time with the power off and then reconnect power you should be able to work out at least which wire set is at fault.
dont forget to rate me the thumbs up or not.

Jan 12, 2011 | Rockford Fosgate P3001 Car Audio Amplifier

2 Answers

Legacy audio LA590 car audio amp protecet mode

Is that on all the time or are you saying the light is on? If that light is always on that just means it's protecting your amp. If it's off and not playing bass then your in trouble

Mar 01, 2010 | Legacy Audio American Legacy II LA590 Car...

1 Answer

Amp is getting power but its not playing

Checking wires doesn"t help unless you are checking them with a multi-meter. Amp needs 4 things to turn on. 1) 12volt power from battery, 2) 12 volt power from radio (remote turn on), 3) ground (solid ground to the chassis or the car free from paint or rust), 4) fuses on side of amp need to be good. If any of these 4 things don't measure up then fix them so they do. If all 4 are verified with the meter and still no lights then you might have a dead amp. If the lights are on but no sound, then there are many other things that needs to be checked.

Feb 27, 2010 | Car Amplifiers

2 Answers

I have a pioneer gm-d8400m the amp isnt working

flashing light could mean a few different things. 1- constant power may not be there. check with a test light or multimeter. should read around 12 volts. it would be a good idea to check all the power and ground leads. make sure u have a good ground. 2- bad sub. im assuming sub since its a monoblock amp. you can meter the subs. make sure the total ohm load is no less than 2 ohms. any lower the amp will go into protect mode. 3- bad amp. power supply may be bad. the newer pioneer amps are full of protection circuits. ive been a professional installer for a shop about 8 years and we sell pioneer. hope it helps.

Dec 25, 2009 | Car Amplifiers

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Amp protector light going on and dimming


first thing you want to check is the fuses in the amp, and power wire if applicable. This might cause the protection light to come on. I do assume you are referring to the protection light on the amp itself and not your car.

Post back if you have checked your fuses and have still not solved the problem.

Thank you for choosing Fixya!

Oct 03, 2009 | Car Amplifiers

1 Answer

My amp is not working

For the visonik, you should check your speakers. You can use a D-cell battery. Remove the speaker wires from the amp and connect each speaker across the battery (for no longer than a few seconds). The speaker should pop each time the wires are touched to the battery. If they don't, the speaker is defective (assuming the battery isn't dead).

If the speakers are OK, you need to confirm that you have a good signal feeding the amp. You can use the RCA cables from another working amp in the vehicle. Do this with the amp that had the power light lit.

If you have signal going to the amp and the speakers are OK, the only two things left are the power supply feeding the amp (from the battery) and the amp. If you have B+ and remote voltage AND a good ground, the amp is defective.

For the pyramid, the amplifier probably has shorted output transistors. The amplifier will have to be repaired.

Nov 16, 2007 | Visonik V117SX Car Audio Amplifier

1 Answer

Car audio

hi, your amp seems to be getting power but the cables might be wrong so it's not getting enough power. the light on the amp should be green if everything is going well. are you sure the cables are suitable for your amp?

Sep 11, 2007 | MTX RT202 Car Audio Amplifier

2 Answers

Powers on but no sound

Check the main amp fuse under the hood, even if it looks good just change it. Often times that light on the amp can come on just from the power amp tunon wire. Try a friends subwoofer box just to make sure the connectors on your box are good, and if that doesn't work then give me some more details....year/make/model of car, what kind of sub, what types of things do you see on the side of the there a green light as well as a red light?

Aug 18, 2007 | Xtant A3001 Car Audio Amplifier

2 Answers

1000w Sony Xplode car amp

Sounds like the power supply is shutting down because of it sensing a bad output channel. I'm assuming of course that you have checked all your battery, ground, and trigger wires to see if they are OK. Good luck.

Apr 05, 2007 | Sony Xplod XM-554ZR Car Audio Amplifier

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