99 gmc 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=33934
Printed Date: May 13, 2024 at 1:50 PM

Topic: 99 gmc engine noise

Posted By: mikejc
Subject: 99 gmc engine noise
Date Posted: June 15, 2004 at 3:41 PM

i just installed an alpine 4 channel amp into my truck everything good till i started it engine noise bad it gets louder when i rev it . so i checked the ground it was fine but just to rule it out i ran a new one to the frame i ground it with a grinder 4 gage wire for power and ground i even used line out converts and went to rca jacks but nothing seams to work the noise does not go away.does anyone have an answer???

Replies:

Posted By: boomer_106
Date Posted: June 15, 2004 at 7:48 PM

You could try running your ground straight to the battery. Its also a good idea if you run the power wires down one side of the vehicle and the signal wires down the other. You could also try a filter on the power line. You also may wanna search here for posts with engine noise. I imagine you will get some suggestions.

Posted By: Chad7n7
Date Posted: June 15, 2004 at 8:02 PM

Also try running a grounding strap on your negative post on the battery to a chassis ground. This may help, the newer GM's have poor grounding.

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Posted By: funnycar
Date Posted: June 16, 2004 at 8:22 PM

My `99 Silverado had the same problem; I did 3 things and got rid of the whine.

1. Ran an extra ground wire from the back of the HU in addition to the HU harness ground wire.
2. Changed to higher quality RCA`s.
3. Added 2 extra 4 guage ground wires from the battery post-one to the alternator bracket, the other to the body bracing by the radiator.(+ feed line is 2 guage)

All these ideas came from this forum and they work great.

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