Does anyone know what this wire is for?

[Lorenzo]

Ok so got a new one today from canadian tire for $8! It was a 4guage wire though so it was a bit bigger but looks pretty nice in the engine bay, didnt notice anything different when i started it up but its prolly better than before! 😛

 

[80ELCAMINOFLAKE]

Ya u wont see a difference, but its needed...glad u took care of it