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Ammeter Shunts And Ground Loops

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=148563
Printed Date: March 23, 2026 at 8:06 AM


Topic: Ammeter Shunts And Ground Loops

Posted By: couchflambeau
Subject: Ammeter Shunts And Ground Loops
Date Posted: March 23, 2026 at 3:56 AM

Hello all,

I'm in the process of installing a large audio system and installed a shunt on the ground side of my amplifier rack which then goes to a common piece of 2/0 wire that goes to my chassis ground in the back of the car.

Im noticing an alternator whine with the car running. I believe the shunt is rated as 200mV.

Can the shunt resistance be causing a ground loop?


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