All I know is that it is recommended to use a higher rated alternator for more powerful sound systems. It has also been recommended (though now I do not know how widely accepted) to replace the wiring harness for a beefier alternator.

My system isn't huge by any means, but I am running two amps and I know it will draw a bit of current. And 10 ga fits just fine, so the worst thing I might have done was spend an extra buck on wire.

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1982 300CD Petrol/Black Leather