Help identify wire
 

Thick black w white wire. Runs from near left strut tower to interior can trace it to next to shifter.
so maybe power or ground running to the back of car?
its weird there is a ground near it same color
and power wires same color, wish they could have used black and red to keep it simple


https://cimg9.ibsrv.net/gimg/www.rx7...f638abcff.jpeg
https://cimg0.ibsrv.net/gimg/www.rx7...e2c427586.jpeg
https://cimg1.ibsrv.net/gimg/www.rx7...80d151958.jpeg

Never mind finally put battery in and tested it it was ground not power