What wire is this..?

[Wardie]

I was poking around my engine bay trying to get my low beams to work, and I stumbled upon this wire. Its coming out of the fuse box, no idea what it is.

[LJ851]

I was poking around my engine bay trying to get my low beams to work, and I stumbled upon this wire. Its coming out of the spark plug box, no idea what it is.

Quoted for Hilarity.

[89 e30]

Where did you get a sparkplug box? I want one

[Wardie]

Then I noticed when brain bits don't work I call it spark plug box. FUSE BOX

My bad.

Where did you get a sparkplug box? I want one

[schtozo]

It might be the low brake fluid indicator sensor cable