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Kenwood aftermarket amplifier problem

Discussion in 'Automotive Electronics' started by Shane peckham, Jan 26, 2016.

  1. Shane peckham

    Shane peckham New Member

    Jan 26, 2016
    Hello everyone, I am new on the forum. I have a older kenwood kac-7251 2 channel amplifier. It still works great except one problem, it is causing a parasitic drain on my battery. Started about a month ago, I am a auto and diesel technician so I checked parasitic draw, pulled my amp fuse and found it was creating the draw. Now that I did that I have not had a battery issue since. The power light goes off when car is off and comes on when I turn car on. I have had it in this car for 4 1/2 years now. I took amp apart to do some tests and found two rectifier diodes that look like transistors that tested bad but I am not sure if I tested them correctly, one is a fml22s and other is fml22r. Also first thing I noticed with this amp has a cooling fan that was staying on all the time so I unhooked the fan thinking it was the primary issue, battery went dead again in day and half, bought amp clamp and found amp still creating draw. Hope one of you guys have a idea, thank you
  2. KeepItSimpleStupid

    KeepItSimpleStupid Well-Known Member Most Helpful Member

    Oct 30, 2010
    Most amps have a "remote" line which provides switched 12V to turn on the Amp.

    Try to determine if it's the Amp or the remote line causing problems. Make sure the remote drops out as it should.

    The free service manual is here: http://elektrotanya.com/kenwood_kac-7201_7251_sm.pdf/download.html

    It's the PCON (Power Control) signal. Removing the wire off should shut down the amp. It's on PDF page 4.
  3. bwilliams60

    bwilliams60 Member

    Jan 11, 2015
    How much current draw are you seeing? When you disconnect the signal wire, is it gone?

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