Right Wire for the BIG 3?

[stl_style 10+ year member]

ygpm, And I have 4 batteries right now in the trunk. They are run in parallel. Just one of them is grounded to the chassis.
When doing big 3 add wires, Don't do instead of. Don't forget to be safe and add fuses before and after batteries within 18 inches. With one fuse in between the alt and battery.

Do I need to add a fuse to the factory wire ran from the alt to the bat? "

 

[mustang76cnb 10+ year member]

Parallel in the back,the factory wiring i wouldn't mess with chances are they put one where they were needed.

 

[stl_style 10+ year member]

Thanks Bro, I will start on the Batt install hopefully this weekend!

 

[loopkiller 10+ year member]

I thought those cars had bigger than 4 gauge wire //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif

All you need to worry about is the wire to add more batteries. The stock wire should be just fine for the runs to the front. No need to add to that IMHO. Just worry about wiring up your stuff in the trunk.