alternator and engine 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=108321
Printed Date: April 29, 2024 at 12:13 PM
Topic: alternator and engine noise
Posted By: joselmartinez
Subject: alternator and engine noise
Date Posted: October 22, 2008 at 9:55 AM
hello everyone, I new in the forum and looking for some help.
I recently change all my system and after the installation i get a lot of engine noise and alternator noise.
the install was like follows:
Alternator: a 250 amp Ford alternator modified to use a voltage regulator, so it generates from 10.5 to 18 volts.
Power wire: upgrade to 0 gauge from alternator to main battery, to second battery, to capacitor, to distribution block.
Ground wire: upgrade to 0 gauge from alternator to engine, to chasis, to battery, to second battery, to capacitor, to distribution block.
Amplifiers: 1 Memphis st-1600d to subs (2 10"Ascendant Audio)
1 Autotek 500s to mids (4 5.25" Crossfire)
1 Pioneer Gm6300 to Highs (2 Crossfire - 2 Lanzar Opti)
Sound Processors: Audiocontrol LC7 to convert the signal from factory head unit
Lanzar optix 10 Crossover
All remote signal came from a switch wich it's feed from the distribution blocks.
also the ground fee for all equipments came direct from the battery, there's no chasis or metal ground.
along all this installation i ran oxigen free rca wires.
when i turn on the engine i hear a whine noise and when i trun on the lights i hear a disgustin alternator noise.
can anyone help me find out what or where did i go wrong, cause i've been strugling with this for the last 4 weeks and still the same.
I'll appreciate it. I almost forgot that the current power to the system is 15.3v, thru the voltage regulator of the alternator, it is like that, because I'm a car service driver and we use a trunk mounted 2way radio wich uses this power to transmit at 225 watts ( the average is 65 used by goverment agencies) so you can have an idea.
Replies:
Posted By: supradude
Date Posted: October 22, 2008 at 10:06 AM
Did you run the power wire on the opposite side from the rca's/speaker wires?
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'85 Toy
Posted By: DYohn
Date Posted: October 22, 2008 at 10:14 AM
You didn't list your head unit. What is it? How is it grounded? Also, is your transmitter on when any of this noise is detected? Is the ignition system in this truck fully shielded? Are any of the amps or any of the RCA cables running over or mounted near the ECU? ------------- Support the12volt.com
Posted By: joselmartinez
Date Posted: October 22, 2008 at 11:08 AM
supradude wrote:
Did you run the power wire on the opposite side from the rca's/speaker wires?
yes i did.
Posted By: joselmartinez
Date Posted: October 22, 2008 at 11:13 AM
DYohn] wrote:
ou didn't list your head unit. What is it? How is it grounded? Also, is your transmitter on when any of this noise is detected? Is the ignition system in this truck fully shielded? Are any of the amps or any of the RCA cables running over or mounted near the ECU?
I'm sorry, It is a 2005 Lincoln Town Car with the factory head unit, that's wy I'm using the audiocontrol lc7. no the transmiter is off. can you enlightme about the ignition system shield?, no wires for the amps or RCA are running near the ECU, the LC7 it's mounted on the trunk due to space availability.
Posted By: joselmartinez
Date Posted: October 22, 2008 at 11:46 AM
this are the pictures of the istall **EDIT** Please include your pictures in your post.
Posted By: i am an idiot
Date Posted: October 22, 2008 at 1:49 PM
Bypass the Lanzar piece and see what happens.
Posted By: supradude
Date Posted: October 22, 2008 at 3:15 PM
These are hard problems to find sometimes. Try changing out piece by piece to eliminate which one is faulty. Start with the Lanzar like "i am an idiot" suggested first. Lanzar equipment isn't what it used to be. That could be the culprit. Good luck.
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'85 Toy
Posted By: joselmartinez
Date Posted: October 22, 2008 at 7:50 PM
ok, maybe there's possibility in the lanzar, I will bypass it and see what happens, also I will heat up the welding points on the groun of all the equipments, I'll post the results...................thanks guys
Posted By: wduson
Date Posted: November 04, 2008 at 1:03 PM
I have corrected my alternator whine problem recently by ultimately buying a well constructed ground loop isolator. But before you even consider that, try to ground all components (Head Unit, EQ, Amps, etc.) to a sanded down part of metal in your vehicle. Sand paper is key to removing the paint in order to get down to the metal.
No matter what, noise will be present but the level of noise is based on gains and sensitivity of your speakers. After adding a ground loop isolator to my system, there is no audible alternator whine or buzzing when headlights are on. ------------- 
Posted By: snhtown
Date Posted: November 04, 2008 at 2:29 PM
i had a problem like that recently and someone on here recomended grounding the rca's/radio and it worked......
Posted By: calijtee1
Date Posted: November 05, 2008 at 9:09 AM
well first of all i'd start with the hi to low converter that is being used. also heres an important part, and mainly on fords..did you upgrade your grounds by the battery to the chassis.easily you can track this unwanted noise. get yourself a multimeter, and measure the reswistance in your ground. with your multimeter hook up one side to your battery neg terminal and the other test all your grounds on your radio for starters, ive had this happen too many times to count.....even if its a factory unit. when you measure the resistance it should be no greater than.03 if its higher theres your prob, but like i said check your high low converter, make sure you get one that has a ground wire to be able to ground the loop.
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installers do it best. we got the magic hands!
Posted By: joselmartinez
Date Posted: November 07, 2008 at 9:07 AM
calijtee1 wrote:
well first of all i'd start with the hi to low converter that is being used. also heres an important part, and mainly on fords..did you upgrade your grounds by the battery to the chassis.easily you can track this unwanted noise. get yourself a multimeter, and measure the reswistance in your ground. with your multimeter hook up one side to your battery neg terminal and the other test all your grounds on your radio for starters, ive had this happen too many times to count.....even if its a factory unit. when you measure the resistance it should be no greater than.03 if its higher theres your prob, but like i said check your high low converter, make sure you get one that has a ground wire to be able to ground the loop.
but my hi to low it's the audicontrol LC7, you think there might be an issue with the ground on it?..........i'm going to try the resistance mesurement, and then the audiocontrol to see what happens, i'll keep posting the results...........thanks man.
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