And one the battery cables.
I took the wimpy battery cables off my Jeep as I was putting in new power cables for my winch. I used the old winch power cables and made them in to battery cables (1/0 gage).
I have both a hot and a ground cable going to my starter and my alternator.
My Jeep never had the starter motor spin so fast before, it's a
PowerMaster XS torque not some wimpy auto zone special. During the summer time I can pump my pedal a couple of times and just touch the key and the motor spins up and starts.
I really believe in a dedicated grounds and running the biggest wire I can to the starter and alternator.