kenwood ground loop problem

Hi Guys,

I've got a 2004 Nissan Titan with a rockford amp running 2 12" subs and I have the kenwood xxv-05v head unit.. all the speakers are connected to the head unit and I have the altinator whine when the truck is running and it's loud.  I can not get rid of it, I've regrounded my amp, I've run new Grounds, I've used ground loop isolators I've grounded the head unit to the battery, i've grounded the brain to the chassis twice, and the ground I used was paint gone, bare metal, bolt through the floor with star washer on top and bottem. I've even grounded the RCA's and I have no idea what to do next, I'm thinking it's the head unit.  where can I take it to get inspected ,and if it is what do I need to tell the repair facility to get the right thing fixed.  Any thing that helps is more than appreciated, If i've missed something let me know and i'll try it too.

thanks in advance,

Chris Mulkey

Is the buzz comming from the sub or door speakers?

Is there a factory amp in the car?

Does the noise stop when the key in acc (motor not running?)

Set the hand break to turn off the day time runnig lights, noise go away?

Is illumination hooked up?

Try running a power from battery (temparary) to red and yellow of deck (isolated from dash wire) and try.

There used to be a factory amp in the truck, It had the rockford fosgate factory amp in it.  I have bypassed the amp and tied into the speaker wires directly.  I only have the whinning when the truck is running.  In Acc the sound is gone. No running lights, Illumination is not hooked Up, I have a wire run directly from the battery for the constant 12 volts and I tied into the Acc at the key to see if that worked,  I have nothing tied into the factory stereo wires.  I'm going to try a diff. head unit tomm. 3.24.07 we'll see if it work.  Thanks Ispker for hanging in there with me. 

Do you think if i run the Acc wire through a relay that might be the trick?

Chris Mulkey

Ok, I hooked up another head unit and guess what, Noise is gone.  So, Now It's going out first thing in the morning to the repair shop.  I just hope they will find something wrong and be able to fix it, and not just say I had it wired wrong or say I need a new head unit.  We'll see if it's fixed when i get it back.

Thanks everybody for your ideas and your help,

Chris Mulkey

yea but pioneer has always had ground  problems one way they tried to fix was to fuse the ground,lol that worked really well, junk. the 06 and new pioneer headunits have said to be ok.

i have never had a problem with a kenwood headunit and i have ran them for 15+yrs...