Originally Posted by Fabulist
Thanks, totally missed fuse 27. That should give you a place to start. Good luck.
Quick follow-up: I checked voltage on Fuse 27 against Ground, and whether the car is in sun or in shade, the same voltage (13.4V) is present. As I understand it now, fuse 27 protects the power supply to the SBPC. The power produced by the solar panel does not go through that circuit and cannot be detected that way.
Looks like the best, and only bet, is to measure the inputs to SPBC, while the car is sitting in sunlight, to see if there is any power coming from the array.
Here is a link
to a photo of the metal cover of the enclosure that houses the SPBC
Itís located under the carpet of the passenger side footwell, or so I am told.
The metal cover hinges up and the SPBC is inside the enclosure.
The quest continues.