I have a 98 audi a4 quattro 1.8t and I jsut finish replacing the Heater Core, But when I tried to start it. It would not start. Come to find out that there is this light green/Black wire that goes from the fuel Pump relay fuse to IDk. Please help

The fuse is :431951253d pa66-gf30k

A quick google search let me know it was to the fuel pump relay. Now i need to figure out where the light green/black Wire goes to.

Note: previous owner did a lot of rigging so it may be the wrong color all together

Ik that there is a blue thick wire that goes to the fuse also