i have added my 3G alt, and i want a 4ga ground too. where are good places to add it? I can't get the main ground (behind the intake to the firewall) off. the nut will loosen, but there are other grounds connected to it that spin and start to wrap around the bolt. i can't see what's going on, and i don't want to wreck what exists. so where are other good points to add one? also, should i have a direct ground from the neg. terminal on the battery to the chassis as well? i had one with a big stereo, but i removed it all, along with that ground. opinions? thanks