Question about Kenwood KAC-9102D Car Audio Amplifier

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Kenwood amp

Hi sir i hooked up a kenwood amp in my truck and my amp will turn on and then off i checked the volts with a meter and i have 12volts with my sterio off but when i turn my system on and check it i only have 9volts

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  • coldbeer Jan 19, 2008

    thanks very much; you guys are great !!



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How big the amp dont forget those thing take lots of juice you need a big wire front battery to amp when the engine running it should be 13.8 to 14.5 volt if anything less than that battery wont get the charge up and check for good ground cheers and dont forget to rate this p.s any other question about our charging system or anything else dont hesitate im ear

Posted on Jan 19, 2008


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1 Answer

Using without parking break

Hi James,

Page 27 of the installation manual ( shows a connection to the parking brake light circuit. It is the Light Green wire labeled "PRK SW" shown below.


If it is connected the way it is drawn, the PRK SW wire is connected between the lamp and the switch that opens and closes depending on the position of the parking brake (set or not). 12 volts is always present from the battery to the top of the lamp. It passes thru the filament to the wire that goes the top of the parking brake switch. So, when the brake is OFF or disengaged, the lamp is off and 12 volts is present on the PRK SW wire to your Kenwood GPS. When you set the parking brake, the ground (symbol is the funny slanted lines under a horizontal line) just under the brake switch passes through the switch and changes voltage at the PRK SW to "ground" or 0 volts. When this happens, the ground on one side of the lamp with 12 volts on the other side of the lamp - make is turn on.

So, what does this mean? Simply tie the PRK SW wire to any grounded metal and the Kenwood will think the parking brake is always set - for as long as it is tied to ground. You can check it with a simple voltmeter to be sure. Set the meter to 12 volts or more, touch black lead to ground & the red lead to the PRK SW wire. Kenwood should only work when at 0 volts (brake set). Release the brake - meter shows 12 volts & the Kenwood shuts off.

I hope this helps & Good luck!

Apr 09, 2014 | Kenwood DNX570HD

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1997 gmc jimmy starter motor not turning

You need a better battery. When you hook the amp meter and read 0.3 the ECM needs to sleep

Jan 05, 2012 | 1997 GMC Jimmy

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My Kenwood DPX-4020 suddenly went "dead". No power whatsoever on the led's and nothing happens when i push any/all of the buttons. I have it reset many times, checked the wiring's and fuses at...

1st you need to check the fuse in the fuse panel in your car to see for some reason the radio fuse is not blown . if is change it . if not take your radio out and see if fuses for radio is blow on back of radio then some have a fuse on the red wire check fuse there too. if nothing buy a digital volt meter and start checking your ground wire to see if it broke . take volt meter turn on dc volts put black test lead on your radio ground then take the red test lead and and start touching the yellow wire to see if you get a 12 volts on meter if you get 12 volts ground is good ... then check the red wire turn on the ignition switch and put the red test lead on red wire and see if you get 12volts if nothing

either you have bad ground or you have a fuse blow in car some were .. if you can't figure it out call a local mecp certified shop and have them look at it ....

its possible that the radio is just died and you need to buy a new one electronics dont last forever when you use them daily ...

Dec 27, 2010 | Kenwood DPX-4020 CD / Cassette Player

2 Answers

Battery won't charge when car is on. Battery is fine. Believe it's a problem with the wiring

If the alternator has been bench tested and passed then you need to check the big wire for 12volts at the alternator. If you have 12 volts then you need to trace the other wire to the PCM. The charging system is computer controlled and its possible the computer is the issue. To diagnose this correctly go to mitchell1diy online and pay the ten bucks for all the proceduers and wiring diagrams. If the charging system light is off then try this. Charge up the battery. Then turn the lights on for a couple minutes to drain the surface charge. Then using a 12v meter hooked to the battery check the draining voltage while cranking. A good battery will maintain a 12 or better voltage even if the truck does not start. If it goes down fast then the battery is bad. Alot of times when a battery is tested using a professional tester they pass. You may need to remove the fuel pump relay so the truck does not start for this test since your testing the cranking amps. Also with the key out of the ignition and doors locked and the negative unhooked at the battery you can check for parasitic drain. Using a amp meter hooked up inline battery to cable you should have less than 1/10th volt. If any more then you have a component not shutting off. Pull fusses 1 at a time till you find the system thats the issue. Watch the meter as you pull fuses

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1 Answer

Wont turn on. everything should be connected properly, got new fuses to make sure. It worked fine until i dismounted and disconnected it from the battery. When i reconnected it, no luck it is a Autotek...

Make sure this high powered amp is not mounted directly to the chassis of the car. Mount it to a wooden board and you can screw board into the car. Because some very high powered amps can arc and damage itself.

Next make sure the tubular fuse in the hood is not bad it may look good but internally it got real hot and caused a bad solder connect in the fuse. You can test it with a meter. Measure one side then the other side if the 12 volt is going thru the fuse.

Next step is now you know your amp is getting 12 volts from the car battery but do you know if your amp turn on signal is turning on the amp itself. This is a easy test get a little wire and jump the 12 volt to the amp turn on wire if the amp comes on then you have found your problem. The amp turn on voltage is too weak were ever youve connected the signal. Normally you hook it up to the blue/white wire on the back of the radio first. If it doesnt have one hook up to the blue. Now on some very rare occassions the voltage drops when you put a load to it and is not enough to turn on your amp you can easily see this if the voltage across the blue wire goes below 12volts so hook it up to the red ignition wire so at least when you turn on your radio the red will send 12 volts to the amp to turn it on and will not drop in voltage. You see that wire has to be 12volts when it drops the amp will not turn on. Same with the battery Voltage you have to maintain 12 Volts or higher for the amp to operate.

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1 Answer

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It is probably the remote amp wire or power antenna wire. you can check by hooking up a volt meter set on 12 volts DC and see if there is power when you turn on the unit

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1 Answer

Car amp wont turn on

I'll assume that you've checked the amplifier's on-board fuses.

With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp (not on the point where the ground wire connected to the vehicle) and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.

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3 Answers

Kenwood KAC-7202 wont turn on

I have found the problem to my Kenwood KAC-7202. The amps fan was the only thing that would come on thats it. So I started checkin zener diodes cause all transistors checked out fine. So I remember readinf about a guy that had same problem and took it to a shop and they said it was some diodes. Well, thats what I was thinkin or the transformer. It turned out that 1 zener diode was no good, diode D9 1ss133. I took a zener out of an old vcr I use for parts and put it in and the fan came on as usual then the red light. Then I hooked my mp3 player to the rca input and hooked up some speakers and it works great. Hope this helps you other guys with the same problem. Check your zener diodes with a digital volt meter, if you get any measurement other than the reverse impedance which will read between 600 and 1200 ohms some lower or higher and then reverse the leads on your meter and if you get any reading it's no good and the reading will be 0-50 cause mine read 047 ohms.

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1 Answer

My kenwood kac7201 amp wont turn on but it has power to it

Recheck the voltage precisely like this:

With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.

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1 Answer

Can't get my amp to turn on

You need to confirm that you have sufficient B+ and remote turn-on voltage.

With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.

Jan 06, 2008 | Kenwood KAC-9102D Car Audio Amplifier

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