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Hi mt name is Robert..
This is a VERY difficult question, I gave been in the RV repair industry for about 18 years and getting any kinds of prints on older units is next to impossible. My thinking on this is you might have a Battery Control Center (BCC) It would be located outside under the hood, inside would be the solenoids, some breakers and fuses, DO you see that box and if so is there a make and model on it? That would be the only way I might be able to assist you.
I would also get a 12 volt test light and go to the solenoid for the disconnect and see if you have power going to the LARGE posts, if you have power on one side and not the other jump the posts and see if power comes on, that might be a clue. I am not here to take your money but assist you the best I can, you can follow up as much as needed. Let me know on the BCC.... Robert
Sounds like a plan... I am around daily and respond when I can, no hurry on my end... Robert
Was just checking in to see if my answer helped, IF you have more questions or concerns please feel free to contact me... Robert