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Old     (rockcralinjeep)      Join Date: May 2008       05-19-2008, 10:25 PM Reply   
I have a 2002 Centurion Avalanche with the Mercruiser 315, I have a whining noise in my stereo when the boats running.

When I got the boat a year ago everything was fine, except the wiring for the amp's looked like a 12y/o did it. So me in my ultimate wisdom decided I needed to clean it up. In the process I disconnected all power from the batteries, I neglected to move the batteries from there boxes and somehow or another the ground cable came in contact with the positive of the battery. Ever since this happened I have been chasing this problem.

I have
Checked all the grounds
Replaced the deck
Replace the batteries
Replaced the alternator
Put a noise isolator in for the deck on the +
Replaced the cap rotor and plugs
Replaced the amps

Anyone have any advice for me, I'm at a loss and am down to replacing the ECM
Old     (soundbox)      Join Date: Oct 2007       05-19-2008, 10:45 PM Reply   
Marcus - Where are you located? It sounds like you have spent some solid time on the boat. Let me know if I can get in there.
Old     (acurtis_ttu)      Join Date: May 2004       05-20-2008, 6:03 AM Reply   
fuel pump?

This may sound crazy but I went thru something even stranger. What deck are you using?

Try an alpine deck if you have acess to one. IT was the only thing that pretty much eliminated my "whine".
Old     (rockcralinjeep)      Join Date: May 2008       05-20-2008, 8:35 AM Reply   
I'm in the eastbay CA. i have spent some time chasing this down and like i said i'm at a loss
Old     (acurtis_ttu)      Join Date: May 2004       05-20-2008, 8:51 AM Reply   
^^^Before you take it in somwhere double check all your grounds. Did you check back at the block?

Do you have an ohm meter? Start mesuring resistance across grounds, you may be able to find something.

I close to 60-70 hours of my own time diagnosing my issues and spent thousands at two audio one could ever figure it out...then one shop randomly started swaping HU brands...the Alpine removed almsot all the noise.

This was all on a brand new boat. My problem just all the sudden popped up after my 20 hour service.
Old     (bcrider)      Join Date: Apr 2006       05-20-2008, 9:17 AM Reply   
Noise can be from something as simple as your RCA's. If you have them split or they just aren't the best RCA's it will cause noise. Try running a ground in with your wiring from the deck to your amps.
Old     (2onboone)      Join Date: Mar 2007       05-20-2008, 10:01 AM Reply   
i have an 06 avalanche with the same problem has sony head unit
another centurion on my lake does it too
someone told me to put a "noise cancelling diode" in the power supply wires
haven't found such a thing yet
if ya'll figure it out post it up
Old     (acurtis_ttu)      Join Date: May 2004       05-20-2008, 10:04 AM Reply   
^^^^ You can buy power filters but 99.9% of engine whine is ground related.
Old     (rockcralinjeep)      Join Date: May 2008       05-20-2008, 10:13 AM Reply   
i have replaced the RCA's too, guess i forgot that in my list. i bought a $110 set of 4 RCA's. as well i have routed all power and grounds as far away from the RCA'S as posable

(Message edited by ROCKCRALINJEEP on May 20, 2008)
Old     (mcook77)      Join Date: Feb 2004       05-20-2008, 10:17 AM Reply   
I had the same issue when my system was installed. No problems with stereo when boat not running, but a whine when I started the boat. Took the boat to the installer and they put a filter in and it immediately fixed it.
Old     (acurtis_ttu)      Join Date: May 2004       05-20-2008, 10:59 AM Reply   
you can always try a ground loop isolator.
Old     (wakebdr2002)      Join Date: Apr 2007       05-20-2008, 11:59 AM Reply   
What kind of amps are you running? I had engine noise through my tower speakers and I couldn't figure out where it was coming from. I replaced the cheap factory Kenwood amp with a JL 300/4 and the noise disappeared.
Old     (rockcralinjeep)      Join Date: May 2008       05-20-2008, 12:22 PM Reply   
The ground loop isolator, does it go on the alternator or on the radio? i put an isolator on the alternator it did nothing so i removed it.
Old     (rockcralinjeep)      Join Date: May 2008       05-20-2008, 3:40 PM Reply   
Old     (hatepain)      Join Date: Aug 2006       05-20-2008, 8:13 PM Reply   
Why are you yelling? They're only trying to help.
Old     (soundbox)      Join Date: Oct 2007       05-20-2008, 11:39 PM Reply   
Marcus - I know Sacramento is a drive but I have had people from Tracy, San Ramon, Napa and even San Luis make the trip to us. Let me know if I can help out or if you want me to find a knowledgeable dealer in your area. I do treat all WakeWorlders as best possible.
Old     (acurtis_ttu)      Join Date: May 2004       05-21-2008, 5:53 AM Reply   

Search the audio forums there are certain models of pioneers that are natorious for making engine noise. It has to do with the RCA outs ont eh back of the radio not being grounded properly. You basically haev to ground each RCA out back to the radio chasis, if memory serves me correct. Most of the big audio forums haev sticky's about this issue. It's fairly well known.
Old     (acurtis_ttu)      Join Date: May 2004       05-21-2008, 5:55 AM Reply   
GLI plugs inline on your RCA's, try it in a few different places, what ever piece of equipment you think is causing the nosie. HAev you tried totally disconnection yrou HU and running an ipod directly into each amp via RCA-3mm plug? This would tell you if it's the HU picking up/causing hte noise.
Old     (mikeski)      Join Date: Aug 2003       05-21-2008, 10:17 PM Reply   

I would get down to basics and try to isolate the noise as Adam has suggested above. You can also listen to your deck RCA's with headphones. I am local, shoot me a note if you need me to walk you through some troubleshooting.

Old     (jaytique)      Join Date: Feb 2007       05-23-2008, 9:28 PM Reply   
possibly the noise reduction unit on your alternator is out, its the small black box looped to the batt post. just a suggestion
Old     (2onboone)      Join Date: Mar 2007       05-24-2008, 9:57 AM Reply   
i fixed my centurions problem
i took yall's advice and totally isolated my stereo system
did seperate grounds and fused power circuits to stereo system
put relay to the key switch so it's not getting any direct power from the key switch
also had a bad connection at the plug for my tower speakers
it worked for my boat
hope this helps
and thank all you for your experience and knowledge


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