Question about Kenwood KAC-859 Car Audio Amplifier

2 Answers

Kenwood kac 859 amp

How do I reset the amp... the red light is flashing on the amp...the car was bought used and i have no information on the amp.. the amp has power.. it has good ground. the amp trigger wire is also working with the key on and the fuses are good.. but i cant seem to get any sound outta the speakers... thanks

Posted by on

2 Answers

Re: kenwood kac 859 amp

The amp will reset every time it's turned off. The red light flashing, instead of staying constant is a warning that one of the protection circuits are activated. If the amp is bridged wrong, it can do this. If the load impedance is too low, it can also do this... don't trust the speaker, it it says 4-ohm, it may actually be 3.8-ohm, which could cause a problem if two speakers are wired in parallel. If it's not getting enough power, it will turn off briefly, but will turn back on after a second. A capacitor is not necessary with this, just use 4 gauge cable and have a good battery... make sure the ground is good, that one is commonly ignored.

Posted on Aug 21, 2007

  • Level 1:

    An expert who has achieved level 1.


    An expert that hasĀ over 10 points.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 11 Answers
Re: kenwood kac 859 amp

Hi, note that if you are not using the proper gauge b+ and gnd cable with this amp then the current available at the amp wont be sufficint to keep amp on. also try using this amp while vehicle is idling. if this doesnt work then disconnect all spks from amp and check if red lite stops flashing. if it doesnt stop flashing then amp has internal fault. if lite stays on brite then proceed to check each spk load impedance, then reconnect each spk individually. the minute red lite starts flashing it will give you a clue that the channel or spk load is faulty. cheers

Posted on Aug 05, 2007

Add Your Answer

0 characters

Uploading: 0%


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


3 Points

Related Questions:

1 Answer

My Kenwood kac9152D turns on but why dose the red light on the top keep flashing?

The manual only says the power indicator burns when the power is on.
I can't find anything about it also should flash. The only thing I can think of, it has detected an error, like a blown amp or a low impedance on a speaker terminal.
Here is the manual:

Jan 17, 2015 | Kenwood KAC-9152D Car Audio Amplifier

1 Answer

How many watts dose a kenwood kac-859 have

80 Watts x 4 + 240 Watts x 1 It all depends on how you have it hooked up. Let me know if you need additional information on this.

Jan 03, 2011 | Kenwood KAC-859 Car Audio Amplifier

2 Answers

Red Light

that means you probably have a shorted speaker wire, a bad speaker or the amp itself is bad, try disconnecting the speakers one at a time and see if it turns on or not. if the red light stays on with no speakers hooked up it means the amp is bad

May 30, 2009 | Kenwood KAC-7252 Car Audio Amplifier

1 Answer

Blinking E-03

somthing is fried on your motherboard

Apr 28, 2009 | Kenwood Excelon KAC-X811D Car Audio...

1 Answer

Kenwood kac-x1r flashes code e-03


Apr 16, 2009 | Kenwood KAC-X1R Car Audio Amplifier

1 Answer

Amp Problems

Unplug the stereo input signal from the amp. If the amp does not do it with the wires unplugged, you may have a problem with the radio sending too much voltage to the input of your amp causing it to go into protect mode. If it continues it is in your power source to the units. Let me know and I'll see what Ii can do. Hope this helps...

Jul 14, 2008 | Kenwood KAC-859 Car Audio Amplifier

1 Answer

Amp Trouble

Actually, it's more likely that the problem is on the outside of the amplifier than the inside. Your problem may be caused by a ground wire that's come loose from the grounding point, a defective fuse or corroded connection on the power wire, an overload of the remote input wire, or a problem with the head unit that your amp is connected to. The easiest way to troubleshoot is with a voltmeter. Test the voltage at the amplifier's main power terminal and remote terminal while the meter's black probe is connected to the ground terminal. If you find voltage dropping on one of the terminals, you can focus your attention on that wire.

Mar 09, 2007 | Kenwood KAC-7202 Car Audio Amplifier

Not finding what you are looking for?
Kenwood KAC-859 Car Audio Amplifier Logo

634 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

1315 Answers

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

Answer questions

Manuals & User Guides