TeamSwift

Home of the Suzuki mini-compacts ! Your Home for all things Suzuki Swift, Geo Metro, Holden Barina, Chevy Sprint, Pontiac Firefly, and Suzuki Cultus. TeamSwift is a technical performance oriented community!
It is currently Sun Nov 19, 2017 7:35 am

Underbody braces, turbos and more!

All times are UTC - 5 hours




Post new topic Reply to topic  [ 3 posts ] 
Author Message
 Post subject: Major interfearance??
PostPosted: Mon Jul 17, 2006 4:50 pm 
Offline
User avatar

Joined: Sat Jul 23, 2005 4:00 pm
Posts: 38
Location: Shrewsbury
Right guys just installed a new sound system need some help its all working ok when ignition is on but as soon as the engine is started there is a constant hummimg noise from the speakers and its effected when lights go on etc and hummimg becmoes louder when engine is revved also the sub starts going off on its own and gettin alot of interfearance what could this be is it the earthing of the sysyem? at the moment its eathed to one of the bolts that holds the parcel shelf up it is very annoying any Advice cheers sorry if this as been mentioned b4 did do a search couldnt found nothing


Top
 Profile  
 
 Post subject:
PostPosted: Tue Jul 18, 2006 4:30 am 
Offline

Joined: Tue Jul 11, 2006 5:18 am
Posts: 12
Its often referred to as a Ground Loop, and can be very easy or very difficult to remove... last time it happened to me i just purchased some ground loop isolators and plugged then into the rca's between head and amp.

But here's some reading....

http://www.smartalix.com/Consumer/troubleshooting_your_mobile_audi.htm

Quote:
Start at ground level
With few exceptions, everything electrical in a vehicle is tied to a common ground, the vehicle chassis. (In the future, non-metal-chassis cars will probably have bus bars running the length of the vehicle for grounding purposes.) This common ground starts at the cable running from the battery to the frame in the engine compartment, and ends at every device in the vehicle.

One of the most prevalent problems with car stereos is a hum or whine coming from the speakers. This is usually caused by a ground loop, and/or poorly shielded electrical noise from the engine. (The reason the whine changes pitch while you drive is that it is linked to the engine’s speed.) A ground loop is a condition where an unintended connection to ground is made through an interfering electrical conductor. It is a problem where many fingers are pointed, but where nobody is truly at fault. Neither the manufacturer nor the installer can usually predict where a loop will occur.

The best solution for a ground loop is to make sure that every component in the system is grounded to unpainted body metal using a wire of good quality the same size as the line providing power to the device. For example, don’t rely on the ground wire behind the dash for your head unit. Run a fresh wire for ground, and make sure it has a sturdy connection at both ends. Then move on to the amps and any signal processing gear that may exist.

If that doesn’t work, you can also add filters to the signal lines (the ones with RCA jacks) and/or adding filtering devices to the spark plug wires and engine coil. Usually grounding the system properly is enough.



Top
 Profile  
 
 Post subject:
PostPosted: Tue Jul 18, 2006 4:43 am 
Offline
User avatar

Joined: Sat Jul 23, 2005 4:00 pm
Posts: 38
Location: Shrewsbury
Thanks thats some good info :D now i need to get to the bottom of it


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 3 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group