Topic: installed h/u and amp+sub.. now i hear alternator whine.. help

[project black out]

well i finally installed my aftermarket cd player (nothing special waiting for a doubledin screen) and i did all the wiring myself. the amp has a good ground and plenty of power. the a/v cables are seprate from the power and the remote wire. but the problem is i hear a very annoying whine! i pulled the 30amp fuse for the factory ampand the whining stopped but i only could hear the bass non ov the vocals.... any ideas or does anybody know the location of the amp?

[Donnie1]

The amp should be under your console. Take out the storage unit in the cosole, four screws under the liner and you should see it. But I think you may have to remove the whole console to swap it out.

[project black out]

The amp should be under your console. Take out the storage unit in the cosole, four screws under the liner and you should see it. But I think you may have to remove the whole console to swap it out.

right on brotha... now im wondering if i remove the factory amp will i lose sound? because i removed the 30amp fuse under the hood that was labled (amp)... now when i did that the whine did stop but i couldnt hear any vocals or instramentals... only the bass that was comming out of my sub... any ideas?

[Donnie1]

You may have to bypass it completely and rewire the speakers.

[project black out]

You may have to bypass it completely and rewire the speakers.

uhoh! sounds complicated....do you think i could just remove the harness and maybe splice the wires?

[oHIobellboy]

You need to keep that amp for your chimes and such. Enkei is pretty good with this stuff. He'll see the post soon I'm sure.

[Donnie1]

You need to keep that amp for your chimes and such. Enkei is pretty good with this stuff. He'll see the post soon I'm sure.

Good call.

[Enkei]

Ok Ok  Sorry been busy guys...  What kind of amp and what is it powering? JUst a Sub? or did you get a 5Ch for all the speakers and a sub? What speakers are you using?  Stock or Aftermarket? With the right wire harness you might have to turn on the factory amp to get sound from the speakers..  I need more info please...

[project black out]

Ok Ok  Sorry been busy guys...  What kind of amp and what is it powering? JUst a Sub? or did you get a 5Ch for all the speakers and a sub? What speakers are you using?  Stock or Aftermarket? With the right wire harness you might have to turn on the factory amp to get sound from the speakers..  I need more info please...

ok from the top.. im using an 800 watt lansar vibe amp and it is powering ONLY the sub.. i have installed a converter box that plugs into the factory harness. the speakers are stock BOES. and like you said i need that amp inorded to hear any sound.. i unplugged the fuse for the factory amp that was located under the hood and the whine stopped BUT i culdnt hear anything other then the bass comming from my sub.

[Enkei]

The Amp you are using has had issue's with noise but you say it's coming from the other speakers. What harness did you use for the new radio to Bose Amp?

[project black out]

The Amp you are using has had issue's with noise but you say it's coming from the other speakers. What harness did you use for the new radio to Bose Amp?

its a schoche harness and it is used so i dont have to cut the factory harness its a plug n play set up. i havent done anything to the factory amp. i didnt know that the avalanchehad a factory amp till i started doinf the ftdrl's mod and i looked at the lable on the cap and noticed a fuse that said amp... now you said my amp has had issues with noise, but i had a buddy hookup his audipipe amp and it has the same issue... to be honest i want to go back to my factory radio but like a dumba$$ i threw it away

[Enkei]

If I remember right there is a Blue and white wire that you need to hook up for power for the factory amp..

[project black out]

If I remember right there is a Blue and white wire that you need to hook up for power for the factory amp..

 
the problem is the factory amp. thats watis causing the whine.. im trying to figure out how to bypass it

[project black out]

bump.

[project black out]

bump still havent found a solution... any help guys

[Main One]

Sounds to me like you've got a ground loop situation which is picking up electrical noise generated by the alternator, or I suppose it could be on the power leads.  You should run separate leads for power, and ground unless grounded to the chassis, back to the same point(s).  If you daisy chain around and form a loop somewhere, vice say "spokes", you create a loop antenna which is effective at picking up electrical noise.  In a building, you'd hear a 60 hz hum in a ground loop situation, with a small 60 hz signal running around the ground loop which would be picked up by a PA system for instance.

Edit - you should probably also look for instances where you have grounded a shield wire at both ends of a shielded cable, most likely feeding an amp.  The loop could be with the shield and the other ground path back through the chassis or a power lead.  You only need to ground a shield at one end of a shielded cable.

[project black out]

Sounds to me like you've got a ground loop situation which is picking up electrical noise generated by the alternator, or I suppose it could be on the power leads.  You should run separate leads for power, and ground unless grounded to the chassis, back to the same point(s).  If you daisy chain around and form a loop somewhere, vice say "spokes", you create a loop antenna which is effective at picking up electrical noise.  In a building, you'd hear a 60 hz hum in a ground loop situation, with a small 60 hz signal running around the ground loop which would be picked up by a PA system for instance.

Edit - you should probably also look for instances where you have grounded a shield wire at both ends of a shielded cable, most likely feeding an amp.  The loop could be with the shield and the other ground path back through the chassis or a power lead.  You only need to ground a shield at one end of a shielded cable.

i must of overlooked this post... now that i think of it i have coiled my power cable because i had too much of it and i didn't want to cut it... I'm also thinking of changing the ground location.. right now its on one of the mounts of the rear seat.. i scratched it to bare metal but I'm gonna look for another location