Alright it is a 89 civic sedan, and right below the distributor is a set of wires and one of them is white and it is going to the o2 sensor, and the red and the green wires are going to what i assume is the temp gauge sensor, and then there is a single solid yellow wire going to nothing, it has been snipped by someone other than myself, i just got the car a week or so ago. but i thought someone on here might know where it goes thanks Toren

 

There is a yellow and green under the distributor
that goes to the reverse light sensor
on the transmission..reverse lights work?

 

Good call that might be it let me check, the car used to be a auto and now its a 5speed so that could do it thanks Toren