Question about Kenwood KAC-8103D Car Audio Amplifier

1 Answer

Doesn't turn on

Amp turns but only for a second.

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 631 Answers
Re: Doesn't turn on

Measure the DC voltage across the B+ and ground terminals as well as across remote and ground. If you have less than 11 volts when the amp tries to power up, the amp could be shutting down due to low voltage. If the voltage remains near or above 12v, disconnect all speaker wires and signal cables from the amp. If it powers up, the wiring needs to be checked. If it still shuts down, the amp likely has blown output transistors.

Posted on Oct 03, 2007

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

1 Answer

Hitron hra-2500b amp turns on then turns off

Make sure that you are not over loading the amp. Example - if your amp is only rated for 8 ohm then you can not wire the speakers for a 4 ohm.

Jan 25, 2013 | Hitron HRA 2500B 2 Channel 500 Watt Mosfet...

1 Answer

My amp keep going into protection mode everytime the bass is turned up,it didnt do this before.?

Chances are you have a shorted output or partially / completely blown speaker. Check all speaker output impedances. If one of them is significantly lower, disconnect that speaker/output and try turning the bass up again. If it works fine, trace that wire to the short or blown speaker. If all impedances look ok, or disconnecting that output doesn't help, then it's time to rip the unit apart and diagnose the amp.

Nov 08, 2011 | Car Amplifiers

1 Answer


Most amps have a remote on terminal, which takes a small current wire to "turn on" the amp, and when you stop current to that terminal, it turns off the amp. It sounds like this current is still live when you turn the car off, so your amp doesn't know to turn off.

With the car off, test the lead at the remote on terminal (usually blue wire, as I do it) with a dc meter or test probe. If it reads +12v, it shouldn't. Find a new "remote on" power lead. This is generally provided by the "power antenna on" lead out of the deck. Run a wire to the amp from the power antenna on lead, and retest.

I'll bet on success after this.


May 05, 2011 | Rockford Fosgate Punch 200a4 Car Audio...

1 Answer

Car Power Amp not truning on for 60 to 120 seconds in cold weaher

could be internal problem with the amp, but there is a possibility it is something else. Are there other amps in your car? Do they turn on quickly? If this is the only amp, try the following:
- disconnect turn-on lead from amp (blue wire?)
- turn on stereo (volume normal or low)
- use small piece of wire to connect 12V terminal to turn-on terminal.
you can just touch the wire to the terminals - paper clip will work, too.
- if the amp still takes forever to power up, then the problem is internal to the amp.
- if the amp powers up right away, the problem could be in the turn-on output from your head unit. You can resolve this by using a relay, or by using the ACC output from the ignition (red wire at radio wiring harness) to turn on the amp.

Jun 28, 2010 | Orion Car Amplifiers

1 Answer

Hello. My Kicker kx200.4 is acting funny. The red display light on front/top of the amp is turning on for a second and then turning off, repeatedly. The light on the side (power) is also turning on, red...

the amp is a 200 Watt by 4 im guessing and its doing that because its going into protection mode unhook the subs if it stops then 1 you have a bad sub or 2 the subs are too much for the amp if an amp is rated 200w per chanel its 200 max about 75 rms or 75 normal constant power

Feb 05, 2010 | Kicker KX200.4 Car Audio Amplifier

1 Answer

Subwoofers stop working after few seconds

Check the subs wiring... follow the manual....

Jul 16, 2009 | Car Amplifiers

1 Answer

Amp not staying on

Hello lyttle_matt1,

Connect a DC voltmeter between the "remote" (+) terminal and the "ground" (-) terminal on the amp. When you turn on your Pioneer, you should read 12-14V. If you get voltage for a second and then it goes away, either the incorrect wire from the head unit is connected, or the head unit remote turn-on is defective. If the voltage remains on the terminal and the amp immediately turns back off, it's possible that the remote turn-on is not supplying adequate current for the amp. To determine if that is the case, run a separate wire from a positive (+) accessory terminal (cigarette lighter or fuse box) to the amp remote terminal. If the amp then turns on and stays on, you'll need to wire a relay into the turn-on wire. The wiring for such a relay is shown here. Most any 12V SPST or SPDT relay from an auto parts store or Radio Shack will work OK.

May 11, 2009 | Sony Xplod XM-554ZR Car Audio Amplifier

1 Answer

Amp turns off after about 5-10 minutes of use for a few seconds

One of two things...Amp is going into overload protection (should be indicated by a light on the amp), or you have insufficient power going to the amp....if this is the problem, try a 2 farad capacitor on the input power line to the amp.

Mar 12, 2009 | Kenwood KAC-8104D Car Audio Amplifier

4 Answers

Amp turns off

Sounds like remote turn on wire is bad. If using aftermarket HU, find another location to power amp. Try the the power antenna wire on the HU to run the REM.

Jan 24, 2009 | Pyle PLAM1200 2-Channel Car Amp

1 Answer

Blue amp light lights for 2sec

bad head unit or look at your ground wire good luck

May 24, 2008 | Car Amplifiers

Not finding what you are looking for?
Kenwood KAC-8103D Car Audio Amplifier Logo

Related Topics:

59 people viewed this question

Ask a Question

Usually answered in minutes!

Top Kenwood Car Amplifiers Experts

Matthew Spark
Matthew Spark

Level 3 Expert

1042 Answers

Tygh Duval
Tygh Duval

Level 2 Expert

290 Answers

Pieter Vleeshouwers

Level 3 Expert

1329 Answers

Are you a Kenwood Car Amplifier Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides