battery charging

I found the correct? solenoid under the oven behind a drawer. The latch-in feature from the momentary "Battery disconnect" switch must be a characteristic of the solenoid because I found no other controls in the area. It seems to operate from the generator and from shore power but not from a running engine, my original problem.
Tenbear,
I looked at the procedure for posting a photo and it looks beyond me. I can email you a picture if you still think it helpful. Thanks.