Precedent Blue Accessory Wire Missing

[Lrbergin]

Recently purchased a 2007 48V club car Precedent. I bought a factory lite kit to install and was just about done when I got to the end and was going to hook up the fuse to the #4 battery and couldn't because I don't have that blue wire that is discussed in the directions. I've tried to do my due diligence and search, but can't figure out why it wouldn't be there, or what to replace it with. Really it's not a big deal to just put one on, but I'm not sure what gauge it should be and don't want to cause any extra issues by using something to small or large. Any help would be appreciated.