amplifier issues

[finnmorgan]

I have bought a car with a very professionally installed Kenwood system from the early 2000s I assume.
The issue i'm facing is in the Kenwood KAC-8404 Amplifier. For some reason the A-channel only output on the right speaker. The mono switch forces audio to the left channel and so there is no output from speakers. The same symptoms occur when I tried swapping the speaker wires across left/right and trying the other speaker pair. And each of the four RCA input cables are working. I'm not sure if this is a failure in the amplifier or wiring. Maybe there is a procedure in wiring it I'm missing?

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[audiobaun 5,000+ posts]

I would pull it out and bench test it. Some Audio shops will Bench test an amplifier fairly cheap or will charge nothing at all to a good returning customer

 

[audiobaun 5,000+ posts]

You can bench test yourself with an HU and a car battery and a Charger

 

[finnmorgan]

Thank you, I'll look into that.

 

[1aespinoza Premium Member]

The mono switch forces audio to the left channel and so there is no output from speakers.

Would you take a better picture of the buttons? When you set a switch to mono I assume you have to bridge the left and right channels.

 

[finnmorgan]

Would you take a better picture of the buttons? When you set a switch to mono I assume you have to bridge the left and right channels.

could the switch be broken from old age? Maybe Ill test that with a multimeter, I was able to take it apart earlier for an inspection and didn't see anything glaringly wrong.

 

[finnmorgan]

the A channel mono/stereo switch works when tested with multimeter

 

[1aespinoza Premium Member]

the A channel mono/stereo switch works when tested with multimeter

You have it wired correct while on mono. Try moving the mono switch on and off several times. It may have become dirty.

 

[huberoy123 10+ year member]

View attachment 46567View attachment 46568
could the switch be broken from old age? Maybe Ill test that with a multimeter, I was able to take it apart earlier for an inspection and didn't see anything glaringly wrong.

Age would be my guess. I wouldn't spend a lot of money on diagnostics or repair. Look for a new unit. Just one opinion.

 

[finnmorgan]

Age would be my guess. I wouldn't spend a lot of money on diagnostics or repair. Look for a new unit. Just one opinion.

Yeah that's what I expected, I was just hoping there was something I was missing that was causing it to fail.