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How about just upgrading your current alternator?
Get a high output alternator and replace your stock one.
Then rip out that wire you did for the big 3 and use 0awg.
Then get an Optima battery to replace your current one.
That should help out quite a bit. If you STILL get dimming, then think about maybe a second alt. I had around 3k watts worth of amp in my old car and it did not dim using what I just described above.
I had a 200 amp alternator.
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