I often find that if the system is working, it is probably connected properly. I have been working hard on a problem in my 95 Classic MH that is not charging the batteries enough.
In the process, I have learned a bit about isolators. (by the way, the top photo/schematic is not an isolator, it is a relay/solenoid). The bottom is an isolator. I have found a few web sites that discuss connections on isolators, one of them is at www.surepower.com/pdf/180012q.pdf
. If you want the main web site, it is Sure Power Industries
The trick for me, and perhaps for you is to figure out all the various wires connected to the solenoids and isolator. My AS schematics are very vague and leave me with more questions than answers, and hours of tracing near impossible wiring.