Guess what else gets attached to the firewall for a grounding point? A head unit. Since the firewall is directly attached to the chassis, the engine ground strap is usually attached there. This is because your engine needs to be grounded to the chassis. This usually happens with engine whine and sourced in the head unit. You get the humming, like engine whine, when one ground point is not at the same potential. For a ground loop to occur, both points have to be properly ground. They can also create an electric shock hazard, since ostensibly "grounded" parts of the equipment, which are often accessible to users, are not at ground potential.Ī ground loop is not synonymous with a bad ground. Ground loops created by improperly designed or improperly installed equipment are a major cause of noise and interference in audio and video systems. A ground loop usually refers to a current, generally unwanted, in a conductor connecting two points that are supposed to be at the same potential, often ground, but are actually at different potentials.
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