Quoted from SkyKing2301:Just as an FYI for people who might find this thread later for similar troubleshooting ... this problem reared its ugly head again. I continued following the path we'd started above; the wire coming off Rectifier Board Connector J3 Pin 8 was confirmed to be getting the proper ~11.9 voltage ... so I followed that wire to see where it went next. It ends in a connector on the SDB. So I pulled that connector and found the end of that wire was fraying/broken and coming loose from the connector pin. I popped it out and re-pinned it, and now it works fine!
Just wanted to say "thanks" for posting the follow up / solution. Was struggling trying to get my recently acquired Sky Gazer project machine working and your comment prompted me to double-check my assumptions when I added the missing J3 connector from the rectifier board. Sure enough, I had swapped the two orange wires and what should have been my 12V wire was only feeding 7.5V. Fixing that got me a step closer to working. 
Walnut Creek, CA
