Cruise Control Question

[CJamerson1212]

Can anyone explain the behavior of a cruise control that is not properly grounded?

 

My Car: 1998 Boxster 2.5L

The CC light comes on when I start the car, then goes out after a few seconds.
The CC light comes on when I press in the CC button on the stalk.
The CC light stays on when I try to activate CC. (pushing stalk forward)
The CC light momentarily goes out when I reset CC (pull stalk backwards)
THEN after attempting to activate CC a bunch of times the CC light will go out and not come back on until I restart the car. Anyone know what this means?

 

Here is my particular run down of events:

• Bought the car in June, and could not get the cruise control to work.
• A few weeks later.. It randomly worked!
• Found water under drivers seat.. pulled all carpet out and hopefully fixed leak.
• Replaced headlights, side markers, brake lights, and 3rd brake light with LED's.
• Replaced both the brake and clutch switches.  While I was under the dash I found a random loose black wire that was attached to the front wall next to where the steering column exits the cabin. The other end of the 8-10 inch wire was corroded and didn't look like it was connected to anything. I ended up ripping it out.
• I installed a load resistor on the left tail light; still no CC.
• I moved the load resistor to the 3rd Brake light wire... Still no CC. 

 

Now I'm kinda wondering if the random black wire I found could have been a poorly installed ground for the cruise control?? 
I'm in the process of upgrading to a double din stereo and have already removed the instrument cluster to run the microphone/ GPS lines how I want. I'm going to go ahead and remove the steering wheel and see what I see.

Any help would be greatly appreciated. 
 

 

Edited August 31, 2018 by CJamerson1212
Added info

[Richard Hamilton]

Because the green light is coming on in the instrument cluster, I think you can assume that the cruise actuator is getting power from fuse B7 (black wire).  There is another black wire which goes from bridge plug BS14/2 (on the relay panel) to the clutch switch.  Could this be the black wire perhaps?  This diagram might help with checking the wiring.