Battery install

[Seamaster]

Hi all

I installed my batteries on a 2001 2120 Pilot house today but got a little confused. There is a thin green wire that I know goes on one of the terminals but I can't remember which one. Without it hooked up, everything seems to be fine but I'm sure it must do something. Does anyone have any idea what this wire is for or which terminal it belongs on?

Thanks in advance!

 

[ppem45]

Here is a download to the wiring diagram for a 2120 PH. If the wire was installed by Parker it will show you what it is for. I just looked and it is what FishFactory said, fuel ground