sebring ground 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=105575
Printed Date: May 18, 2024 at 12:15 AM
Topic: sebring ground noise
Posted By: sstrawsb
Subject: sebring ground noise
Date Posted: June 19, 2008 at 6:07 PM
I hate to do this but I need help. I cant get rid of this ground noise in a customers car. His setups goes as follows: Pioneer 5000 HU Rockford 400.4 Alpine 500.1 (not positive on model) Rockford 1F Cap My other installer looked over it and said it was the amp.. I have my doubts. We replaced RCAs, Radio, the rcas are ran opposite of power, each amp is grounded seperately. I just remember where they grounded the amps to on a bracket that was welded to the floor. If the amp doesnt fix it then im moving the grounds. Anything else I should look for. I did not meter the resistance on the ground wire yet. Help! Thanks
Replies:
Posted By: i am an idiot
Date Posted: June 19, 2008 at 7:25 PM
Posted By: sstrawsb
Date Posted: June 30, 2008 at 3:50 PM
urgh. This car has been the biggest headache. I still get the noise with the RCAs unplugged from the amps. Ive tried grounding the RCA sheilding also. We swapped the RF 4CH for a Alpine MRP-F600 which got rid of a decent amount of noise but still have some faint noise with the car running. Any ideas?
Posted By: i am an idiot
Date Posted: June 30, 2008 at 4:05 PM
Do you have a power capacitor laying around? If so try connecting it at the amp.
Posted By: sstrawsb
Date Posted: June 30, 2008 at 4:10 PM
theres a cheap 1fd RF cap already in there. the noise is so faint but its there when the music is all the way down. Also i didnt notice it at first but when the door is opened and the dome light turns on you can hear the whine follow the pattern of the light powering on or off.
Posted By: i am an idiot
Date Posted: June 30, 2008 at 5:03 PM
Try turning the gains down on the amp(s) until the noise goes away. Then turn the volume up on the radio to see if you can still reach the desired listening level.
Posted By: sstrawsb
Date Posted: June 30, 2008 at 5:05 PM
nothing. I had the amp gains almost all the way down and it didnt fix it....
Posted By: sstrawsb
Date Posted: June 30, 2008 at 5:48 PM
anyone? would rewiring the speakers help at all? Also most of the noise is coming from the driver rear speaker if that helps at all.
Posted By: i am an idiot
Date Posted: June 30, 2008 at 6:10 PM
Switch the RCA jacks at the amp, put the left cable into the right input, and vice versa. If the problem moves to the other speaker there is a problem in the deck or the RCA cable. If the problem stays on the same speaker, the amp or the speaker or the wiring between the amp and speaker is picking the noise up somehow.
Posted By: i am an idiot
Date Posted: June 30, 2008 at 6:20 PM
If the noise moves to the other speaker when you switched the cables, put the cables back to their original locations. Now at the radio, do the same thing that you did at the amp. Now if the noise moves, the radio is the cause of your troubles. If the same speaker has the noise, your RCA cables are picking the noise up. I know that the others are going to tell you to make sure your RCA cables are not run close to your power wiring for your amp. I have never seen this cause a problem. But if you determine that the noice is entering the system via the cables, you will need to remove the trim that was lifted to run the cable. Move the cable into the vehicle a few inches, close the vehicle, start the engine and listen for the noise. Try moving it back a little at a time and see if you can figure out what makes it worse. I have seen fuel pump wiring cause this issue. The reason that the fuel pump can make this noise and your amp power wire does not, is the fact that the fuel pump pulses, thus causing an AC type signal which can be induced into wires in close proximity.
Posted By: dragon breath
Date Posted: July 01, 2008 at 2:20 PM
i had the same problem with my 2000 avenger. their are relays that mount at the bottom of radio cutout inside the dash that radate noise AND the antenna wiring both caused problems in my car.( the antenna grounds on the rear fender and at the radio causing a ground loop) after trying grounding everything in 1 place without helping i broke down and used a ground loop isolator and fixed everything except the pop when the dome lights came on and i fixed that with a small diode on the ground wire to the h.u.
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dragon breath
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