im getting a 200 amp alternator for my f150. im gonna upgrade my 4 guage wire to 2 guage. do you think this will be enough? or do you think i should get 1/0 guage. i have a jbl 1200.1. what size hole should i drill through the firewall? what size grommet do i need? thanks for the help.
If it is enough depends on how far you are going to run it, but yes it should be fine. Someone posted a neato site that had a table of what gauge was required over what distance accepting a .5 volt drop. Good stuff for easy reference but I can't find it now :-( I though it was Glasswolfs homesite but i can't find it there (easily). The size of the hole and the grommet I can't help you with as that will depend on the brand of wire (and what gauge of course) you get, some will have heavier insulation then others.