need help on reading current flow diagrams

[92EcoDiesel Jetta]

I've gone through the electrical section on how to interpret the various symbols but could not find the explanation for this one: a wire that points to a rectangular box with a number inside it. Where does this wire go? What does the box and number inside it means?
For example: Section 15, p 218, track 60 is the water separator sender. pin 2 of the sender has a wire that ends in a box with "18" in it. Where does this wire go?

[arb]

That ususally means a connector. Do you have a photo of the example?

[92EcoDiesel Jetta]

Here's a pic from my cell phone. Hope it's legible. Circled area is the box with number inside.

http://574.photobucket.com/albums/ss184/EcoDiesel/Photo_062909_001.jpg

[92EcoDiesel Jetta]

[92EcoDiesel Jetta]

I think I've figured it out. The number in the box tells you the "current track number" (the bottom row of numbers) so you can easily locate where it goes to on a different page. Anyone want to confirm (or unconfirm) that?

[rallydiesel]

Yeah, it goes to the negative current track for that number (bottom row).