Motor Noise?
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=640
Printed Date: August 18, 2025 at 6:15 PM
Topic: Motor Noise?
Posted By: thumper
Subject: Motor Noise?
Date Posted: May 07, 2002 at 8:08 PM
Question? Could a faulty ground wire cause motor noise?
Replies:
Posted By: NyxBass
Date Posted: May 07, 2002 at 8:11 PM
Answer: Yes. Usually faulty grounds end up with ground loops, making noise. ------------- /NyxBass
Posted By: Velocity Motors
Date Posted: May 08, 2002 at 12:23 AM
Engine Noise: YES Motor Noise : Depends on what you mean by motor noise ? Does the noise come from the speakers in your car ? ------------- Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: NyxBass
Date Posted: May 08, 2002 at 11:57 AM
See, I assumed thumper meant noise in the system...if he means mechanical noise...well Hmmm...I'm not really that knows that kind of stuff as well as audio.  ------------- /NyxBass
Posted By: the12volt
Date Posted: May 08, 2002 at 12:11 PM
Hmm, being that it's posted in Car Audio and most of us refer to motor noise as uhmm motor noise in the system, I'm also assuming he's talking about noise in the system. ;) ...a mechanical noise elsewhere because of a faulty ground, probably not.
Posted By: NyxBass
Date Posted: May 08, 2002 at 7:06 PM
Man, I just read my post above...someone should really learn to smack me before I post things like that! And perhaps it's, like a "cutting out" motor noise cause of an intermittent short in the ground....? Alright, I'm reaching here, and I know it.  ------------- /NyxBass
Posted By: Thumper2003
Date Posted: May 30, 2002 at 6:20 PM
ok .........a good place to start is with the way you wired you RCA cables and whether or not you ran them next to or (parallel) to the power cable........the power cable sometimes carrys a frequency made by the alternator.........if you have your RCA cables next to your power wire sometimes they will pick the noise up and you will hear it in your speakers........it is as simple to fix as re-routing your RCA cable away from your power wire....... Hope this takes care of it .................Lee
Posted By: bberman1
Date Posted: June 23, 2002 at 11:17 AM
This was posted by anoter member ansering your question
Thumper2003 wrote:
ok .........a good place to start is with the way you wired you RCA cables and whether or not you ran them next to or (parallel) to the power cable........the power cable sometimes carrys a frequency made by the alternator.........if you have your RCA cables next to your power wire sometimes they will pick the noise up and you will hear it in your speakers........it is as simple to fix as re-routing your RCA cable away from your power wire....... Hope this takes care of it .................Lee
Posted By: GlassWolf
Date Posted: June 25, 2002 at 12:13 AM
a bad ground usually causes "alternator whine" where the whine in the speakers is proportional in frequency to the RPM of the engine. rev up the motor, and the whine gets higher in pitch.
keep all ground wires as short and close to the component as possible. never run a power wire next to a signal wire (I run power down one side of a car, and signal down the middle, or other side)
use noise filters/isolators/chokes to kill feedback and ground loops where needed
use good, shielded cable
watch out for things like power and high current (fuel pump power, etc) lines run under a floor board or carpet you may not initially notice
and so forth
key words: COMMON SENSE. it'ss save ya every time :)
-------------
-GlassWolf
Pioneer Stage-4, Orion, DynAudio, Fi
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