The easiest manor to fix it is the ground loop isolater as stated. However, be carefull on what one you purchase. I never purchase the poor quality components sold at Radio S. A altenator whine or ground loop is not caused by a failing altenator. There are two primary causes. One is due to having a electrical componant grouded in two seperate locations. When electrical devices ground between those two points they can induce electrical whine. The other cause is due to your cars electrical system. Primarily the spark plugs. These can be replaced with Shielded spark plug cables or noise suppressor caps for the plugs. The key is finding which problem you have. The ground loop isolater won't help if it is your spark plugs. Just as your spark plugs won't help if it is due to your amp ground. I had a 2003 alero, so I can't guarantee what your cars electrical was composed of. I do know that I had a ground loop from my Line Out converter used on the aftermarket amp. If you use a Line Out Converter, ground it at the same location as your new amp. See if your problem goes away. If not, try a ground loop isolater on your RCA at the amp.
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2003 Maroon Alero GLS Sedan. (Purchased new in 2003 with 18 miles, and sold in 2006)
2004 Toyota Corolla LE (Purchased new in 2003 with 87 original miles)
2007 Toyota Camry LE (12 original miles)
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