you upgrade the 3 major grounds under the hood to help keep voltage up especially with systems and stuff like that, i think it goes like this
battery ground to frame
engine ground to battery
engine to frame
i dunno if those are right for sure tho
I just did the Big 3 last weekend. Before, my voltage was dropping to about 12.4 on the heavy bass, now it stays around 14.4 all the time....and no more dimming!
this shit helps alot, I went from dropping to under 9 volts to staying above 12 most of the time...deff worth it...
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