David I can tell you that in my personal experience that the (2) grounds are far more important to replace than the Alternator to the battery! In every installation that we do with 4 ga or larger power wire we add a 4 ga or 1/0 ga ground to decrease the ground resistance in the power flow of the car. The electrical flow of electrons or voltage is increased with better ground potential. In most newer car replace the alternator wire is very hard to do and have special sized connections that make adding another wire or terminal very difficult. If you upgrade the alternator I highly recommend upgrade the charge wire from alt to the battery!
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Jeff Smith
Autosound Specialist
Atlanta, GA
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