I was able to identify the power lines back to the breaker panel in the garage today. It allowed me to connect a set of garage lights. I did talso try the light outside the garage doors, but it tripped the breaker. 🙁
I also put the vent access panel in place that accessed the the other junction box.
It might not be oodles of work, but I have some tender spots form twisting on the ladder and reaching in the access vent hatches. LOL
Just not as limber and young as.I use to be. 🙂