Wire question

Updated
seefingersrun
So today I traded in my Eclipse 1 for a full thickness eclipse. First thing I always do when getting a guitar with active pickups is change the battery for a proper 9v (Duracell). I noticed this black wire coming from the bridge thats not connected to anything (black wire at the top in pictures). Does anyone know what this wire is for as I haven't noticed it in my previous Eclipse. This might be a stupid question so please don't be harsh. Thanx!
Pushead

That's for grounding the bridge if you ever install passive pickups.

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