Harman Kardon wiring fault

Ive fitted a Kenwood stereo into my Range Rover after purchasing one of clarkys attenuators.

Problem is I didnt get any sound when it was plugged in so I removed the pins from the ISO plug and 10pin connectors.

I get sound when all 4 positives are connected, albeit with a loud buzzing but when I join the negatives to the stereo, the sound disappears?

I can get sound AND the buzzing to stop by joining all the negatives ON THE CAR together and leaving the negatives on the stereo unconnected?

I had it like this for a day then all of a sudden the buzzing returned. I connected it all back up the way it should be , + to +, - to - and it worked fine??!!

Went out this morning and I had no sound again so Im back to having only the 4 positives joined up, no negatives on the stereo connected to anything and all the negatives on the car joined together to get rid of the buzzing.

I always get sound with the positives joined correctly, its just the negatives Im having bother with. Sometimes when theyare joined it it fine, sometimes when they are joined I get no sound?
Any help with this would be appreciated.

Hi mate.
Are you going though the low out put ie pre amp or the amped side of the Kenwood?
If its the Harman Kardon system then you need to go thought the pre amp side as there are 5 built in amps one in each door and one in the boot (sub). Also you need to find the wire that switches the amps on, Off the top of my head i think is a gray one and put the blue from the kenwood to it. Also you should have 10 specker wires 2 go to the sub orange/orange black.

The reason you are getting a bussing noise is becouse of the amps in the doors there is someone on here that has made a loom that fits.

Hope this helps has on mine.
All the best

Yes I have bought the loom and fitted it. This is how I have managed to get sound out of the system but I still have the above problems

Sporticus said:

Yes I have bought the loom and fitted it. This is how I have managed to get sound out of the system but I still have the above problems

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Looks like you are going to have to go thought the pre amp (RCA) side of your Kenwood. The buss is called feed back thats coming from your Kenwood amp then the amps in the car is amping that. The only other way of doing it is to rewire the speckers all 11 of them.

Hi mate.
Hows things did you get it sorted?

seems like its the green wires on the car thats at fault. As son as I connect the green/black to anything, all sound is lost yet I connected it to the orange sub wiring and the sub is now working????

It doesnt sound as clear as it did when it was all wired up correctly and working that one time but I have sound and bass so Im happy for now.

Its as if the front tweeters at the wing mirrors arent on? When it was all working as it should there was much more surround sound.

Sporticus said:

seems like its the green wires on the car thats at fault. As son as I connect the green/black to anything, all sound is lost yet I connected it to the orange sub wiring and the sub is now working????

It doesnt sound as clear as it did when it was all wired up correctly and working that one time but I have sound and bass so Im happy for now.

Its as if the front tweeters at the wing mirrors arent on? When it was all working as it should there was much more surround sound.

Click to expand...

Hi Mate.
Sounds like it could be a problem with the wiring that gose into the door mite be worth having a look at. Is it both mirrors or just one?

shaun69 said:

Looks like you are going to have to go thought the pre amp (RCA) side of your Kenwood. The buss is called feed back thats coming from your Kenwood amp then the amps in the car is amping that. The only other way of doing it is to rewire the speckers all 11 of them.

Click to expand...

You can't wire it to RCAs as they are unbalanced and far too high an impedance. You can get away with it, just, for the sub because the common mode noise that the setup is designed to defeat doesn't seem to effect frequencies at which the sub operates. The door amps or DSP amp require a balanced input at 70 ohms impedance. My adaptor (which he has) sorts that little problem out but it's seems he has a wiring fault somewhere on his car, and without physically looking at it myself it's difficult to determine what it is.

In this situation you really need to strip the door cards off and start checking the actual speakers, amps and wiring in there. The Green / Green & Black pair in the 10-pin speaker plug is for the rear left, so I'd start there.