a fellow org. member did this:
use a big guage cable from the battery ground, then connected to: alternator, radio,strobes,lights, engine block:
conclusion: radio plays louder, interior lights are brighter, headlight, taillight, cornerlights tec were brighter and didn't dimm when u use lots of juice.

any thing wlse to add would be well appreciated. thanks

oh if this was last month's new/ sorry, i've been mia.

 

I done it and also added a few more grounds than the person you described. I mostly noticed faster starts and smoother idle. not shure about the lights or radio.

 

I did this as well. Used monsterous 4 gauge then distributed it to multiple 8 gauge in various locations. Didn't notice a whole lot of difference, but the grounding on the 5th Gens seem pretty good from the factory. I mean ****, theres like 4 ground wires running to the timing chain cover for crying out loud. Bout to try it on my 4th Gen. I'll keep you posted.