Re: Need Owners Manual
Best bet would be to contact Suntracker direct, and have your HIN number handy. The wiring diagram may not even be in the owners manual, even if it has one.
The other thing is the dual battery and charger setup may not be original equipment.
If not, the best thing to do is trace the wiring to and from the battery switch, along with the DC wiring of the charger, make a diagram and post it over in the Electrical forum, I am sure you will get an explanation on how your system works.
I have seen a lot of odd wiring done by previous owners to know there are a lot of ways to wire things wrong.