Jeep Liberty nightmare

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jeepstudchris

Member - Posts: 8

Joined: October 04, 2005

Posted: October 04, 2005 at 1:46 AM / IP Logged

So I am in the middle of an install on my brothers Jeep Liberty. With all the wires connected I receive a loud buzz awith thumps. It effects all 6 channels and comes through the sub, mids and tweets. I hear this noise whenever the powere is coming from battery. It does not matter if the stereo is on or off of if the car is on or off, the noise is relentless.

How do I fix it?

sedate

Silver - Posts: 1,173

Joined: July 03, 2004

Location: Colorado, United States

Posted: October 04, 2005 at 8:21 AM / IP Logged

From *all* speakers you say? A nastified ground loop...?

What exactly are you installing in the Jeep? HU? Amps? Model numbers?

Check all your ground connections and make shure they're super tight.. try running a discrete wire from the HU to the battery and the HU ground to the chassis. That has solved lotsa mystery HU problems for me..

"I'm finished!" - Daniel Plainview

jeepstudchris

Member - Posts: 8

Joined: October 04, 2005

Posted: October 04, 2005 at 11:57 AM / IP Logged

I am running Pioneer DEH p80MP head. MB Quart PCE 216 component set up front. Pioneer Premier 4 way Ts-A640P in the back. an MTX 564 amp for the highs and an MTX class D, not sure the model number. An MTX 5500 10" sub.

But can it be a ground loop with the Car on or off...and or the stereo on or off? I mean the key can be out of the ignition.

I thought ground loops only came through when the car was running and the cars electrical was messing things up. This noise is constant unless I un plug the battery.

stevdart

Platinum - Posts: 5,816

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Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: October 04, 2005 at 12:27 PM / IP Logged

The battery doesn't stop providing power when the car is off, does it? And the sheet metal that provides the ground return is still there, right? That should answer your question. ;)

Noise produced when the car is running is usually called alternator whine, but it can come from spark plug wires, etc. too.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

jeepstudchris

Member - Posts: 8

Joined: October 04, 2005

Posted: October 04, 2005 at 12:35 PM / IP Logged

Now how bout for the fact that it happens when the stereo is on or off?

sedate

Silver - Posts: 1,173

Joined: July 03, 2004

Location: Colorado, United States

Posted: October 04, 2005 at 1:12 PM / IP Logged

That's kinda why I think ur battery is introducing power into your audio system somewhere along the line.

But not only can we not see ur installation or check your wiring we still don't know all what kinda equipment ur using...

"I'm finished!" - Daniel Plainview

tcss

Silver - Posts: 1,623

Joined: June 07, 2004

Location: United States

Posted: October 04, 2005 at 1:47 PM / IP Logged

Check and see if your amps are on when you are hearing this thump. Theoretically they shouldn't because your deck is not on, but check the indecator lights.

There is no such thing as free installation!

schmoo

Copper - Posts: 62

Joined: April 21, 2005

Location: Canada

Posted: October 04, 2005 at 6:21 PM / IP Logged

check your ground at the battery. If you have a loose battery post clamp or connection to the chassis, you may experience something to what you are describing.

a true canadian eh!

jeepstudchris

Member - Posts: 8

Joined: October 04, 2005

Posted: October 04, 2005 at 11:17 PM / IP Logged

I am going to bypass all existing wiring. I am going to run + and - from the battery. I am also going to add a toggle switch to a + 12v for my switched power. My only question is with the illumination wire

Is it correct that if I were to not connect the illumination wire, my deck will always have the same brightness no matter what the vehicle displays brightness is?

jeepstudchris

Member - Posts: 8

Joined: October 04, 2005

Posted: October 04, 2005 at 11:22 PM / IP Logged

The illumination for my amps was indeed on with the deck off. I double checked and the remote power was wired into the switched accessory power line as it should be.

With the noise it blew the HU fuse twice. Which I think means that my deck was receiving power through the RCA cables. Other then blowing the fuse should the deck still be okay? Or because the RCAS are on the opposite side of the fuse did it frie the HU?

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