Battery wiring issue

[mvbarry1]

I am installing new batteries on my pop-up camper.  I have two 6-volt batteries I want to wire in series, but I have forgotten which pole (positive or negative) should be the ground.  Anyone know?

Mike

[coach]

I believe this graphic shows it fairly well! Negative ground, white.

[mvbarry1]

Exactly what I needed to push my senior brain into gear!  Thanks!

Mike.

[coach]

brain into gear!  Thanks!

Welcome, a good diagram is worth a MILLION words!