Two Good Batteries, Two Good Ground Points?

[KAC1023]

I just installed a HO alternator on my 00 F350. Today on my way home from work I saw my battery gauge fluctuate a little bit. when I got home I hooked up a multimeter, it ran between 14.4 and 14.9 back and fourth. I asked around and people told me I should upgrade my ground wires. Where are each of the batteries grounded too? is one to the frame and one to the block? Any help with this would be great.

[jbeasts10]

I could be wrong,but I dont see the need to upgrade the ground cables.

[KAC1023]

You can never have too good of a ground, esp with car audio. The Alternator puts out 125 at idle and 250 @ 2000 rpm. Thats a lot of juice moving around.

[JSchuricht]

I can't remember where the batteries were grounded before I relocated them, but what I would recommend is running either a 2 or 1/0 wire from one of the mounting bolts on the alternator to a well cleaned area on either the frame or cab depending on where your large loads are grounded. Also make sure you have upgraded the positive wire from the alternator to the battery.