Battery disconnect or isolation solenoid? HELP!

Chris Bryant wrote:
The solenoid in the picture is the disconnect solenoid and has little (nothing) to do with charging off the engine.
That bottom picture references a service manual- try to find it.

Now I'm even more confused...everyone else seems to be saying this does connect the two battery banks to charge them while driving (i.e. convo about jumpering the two large lugs, etc.) but you indicate that's not true???