Handbrake wiring
 

So I'm doing a fill resto so it was sometime ago that I stripped the interior. I have two cables coming off of the handbrake I no one is the earth but for the life of me cannot figure out what the other wire does! Can anybody help

Also I have a grommet with some cables coming through just in front of the rear seats. Can anybody shed some light on what these are as well

Any help greatly appreciated

I only have one cable on the handbrake. Thats the signal cable. Ground is through the chassis as far as i remember.

The other wire has to go through the chassis to the tank (level sensor and fuel pump)

isn't there a handbrake switch there what also works the abs light ?